• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Corsair vs450 power supply sufficient enough?

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#1
Hi.
I've build my first pc 9 months from now and to be honest it gives me quite a trouble.

Components are :
MB: Asus M5A78L-M LE/USB 3.0
CPU: AMD FX-6300
GPU: ASUS RADEON RX460 DUAL 2GB OC
RAM: 2X 4GB KINGSTON HYPERX FURY 1866 mhz
SSD: KINGSTON 120 GB
HD: 1000.0 GB SEAGATE Barracuda Guardia 7.2K rpm
Power supply : 450W, CORSAIR VS series VS450
Water cooling : ARCTIC COOLING Liquid Freezer 240

It worked all well for first month or two but then I started to have crashes with my gpu drivers which later became a bit bigger issue because my pc had sudden restarts.
Restarts are gone now that i lowered my gpu voltage.CPU aren't stable as it used to be now it has sudden drops from my 4.1 ghz oc to 3 ghz if i don't turn on and off turbo core in amd overdrive.
And today i noticed in my bios that my cpu voltage are marked as yellow on 1.261 volts .I'm sure that before it was entering yellow zone at 1.38 volts and also sometimes some weird cracking noise comes from my psu ,it's not frequent but it happens.What could that mean?
Should I change my power supply?
 
Joined
Nov 30, 2015
Messages
371 (0.42/day)
Likes
388
Location
Croatia
System Name Hallowed Be Thy Name
Processor FX-6300 @4,0 GHz/ i3-2100 @3,1 GHz
Motherboard ASUS M5A97 EVO R2.0/ Gigabyte GA-B75M-D3H
Cooling Enermax ETS-T40-TB /w Akasa Viper/ Stock
Memory 2x4 GB G.Skill Ares @1600 MHz/ 2x4 GB Adata @1333 MHz
Video Card(s) EVGA FTW GTX1050Ti 4GB/ Palit GTX750Ti StormX OC 2GB
Storage Seagate 500 GB 7200 rpm/ WD Blue 160 GB 7200 rpm
Display(s) LG 23MP68VQ-P/ ASUS VW190DE
Case Zalman Z3 Plus /w 5x Scythe Glidestream 1400 rpm/ Deepcool Smarter
Audio Device(s) Onboard x2
Power Supply OCZ ZS 550W / FSP Hexa+ 400W
Mouse Sharkoon Shark Force / Microsoft WMO 1.1A
Keyboard Lenovo SK-8825 / Logitech K520
Software W7 Ultimate 64-bit/ W7 Pro 64-bit
#2
All the things you said are pointing to a power supply issue. If you can, borrow a different power supply and check the voltages, but I'm 99% sure the PSU is the issue.
From what I remember the VS series from Corsair is not regarded as a good PSU, also any overclocking on that particular board is sure to stress it out so that may also have caused issues.
 
Joined
Oct 17, 2012
Messages
8,208 (4.08/day)
Likes
10,436
Location
Massachusetts
System Name Americas cure is the death of Social Justice & Political Correctness
Processor i5 8600k
Motherboard Asrock Z370 Extreme 4
Cooling Corsair H-110i GTX
Memory 2x 4Gb Crucial Sport LT
Video Card(s) MSI GTX 980 Gaming
Storage Samsung 850 evo 250Gb
Display(s) Dell Ultra Sharp Widescreen 24" 1200P
Case Fractal Design Meshify-C
Power Supply Seasonic Focus+ 750 Gold
Mouse Logitech G502 spectrum
Keyboard AZIO MRGB Kaith Blue
Software Win 10 Professional 64 bit
Benchmark Scores Congrats USA!! on the Travel Ban.....
#3
450 W seems sufficient ,but if you begin having problems on a new system ,that are indicative of a bad power supply, it wouldn't matter if it was 1000 W because it could be a bad unit
 
Joined
Dec 31, 2009
Messages
12,344 (4.07/day)
Likes
6,897
Location
Ohio
System Name Daily Driver
Processor 7960X 4.5GHz 16c/16t 1.17V
Motherboard MSI XPower Gaming Titanium
Cooling MCR320 + Kuplos Kryos NEXT CPU block
Memory GSkill Trident Z 4x8 GB DDR4 3600 MHz CL16
Video Card(s) EVGA GTX 1080 FTW3
Storage 512GB Patriot Hellfire, 512GB OCZ RD400, 640GB Caviar Black, 2TB Caviar Green
Display(s) 27" Acer Predator 2560x1440 144hz IPS + Yamakasi 27" 2560x1440 IPS
Case Thermaltake P5
Power Supply EVGA 750W Supernova G2
Benchmark Scores Faster than most of you! Bet on it! :)
#4
This screams unstable overclock to me...CPU clocks do not drop because of a bad PSU or lack of power. There isn't really a 'brown out'. Its on and works and providing enough voltage, or it doesn't.

You are overclocking a hex core CPU on a 3+1 phase motherboard... I'm going to look there before the PSU personally. ;)

Tough call here without swapping out honestly.
 

Aquinus

Resident Wat-man
Joined
Jan 28, 2012
Messages
10,617 (4.67/day)
Likes
5,738
Location
Concord, NH
System Name Kratos
Processor Intel Core i7 3930k @ 4.5Ghz
Motherboard ASUS P9X79 Deluxe
Cooling Corsair H100i V2
Memory G.Skill DDR3-2133, 16gb (4x4gb) @ 9-11-10-28-108-1T 1.65v
Video Card(s) MSI AMD Radeon R9 390 GAMING 8GB @ PCI-E 3.0
Storage 2x120Gb SATA3 Corsair Force GT Raid-0, 4x1Tb RAID-5, 1x500GB
Display(s) 1x LG 27UD69P (4k), 2x Dell S2340M (1080p)
Case Antec 1200
Audio Device(s) Onboard Realtek® ALC898 8-Channel High Definition Audio
Power Supply Seasonic 1000-watt 80 PLUS Platinum
Mouse Logitech G602
Keyboard Rosewill RK-9100
Software Ubuntu 17.10
Benchmark Scores Benchmarks aren't everything.
#5
You are overclocking a hex core CPU on a 3+1 phase motherboard... I'm going to look there before the PSU personally. ;)
On VRMs without a heatsink no less but, restarting under load is definitely a PSU failure characteristic in most cases. Problem is that it realistically could be both. Even if it is the PSU, the board is likely going to throttle due to VRM temps. It's also worth noting that hot VRMs are less efficient which should be factored in. Either way, I think overclocking with this setup is rather unwise.
 

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#6
Guys what you say on these heatsinks for vrm? https://www.amazon.com/Enzotech-Mosfet-Passive-Copper-10-pack/dp/B004CL89D8
Also I'd like to take another power supply.Is it possible to find one that could last for few years and still be adequate for newer systems?
This way seems cheaper than buying new motherboard and even more when there is am4 on the market ....My oc is stable as long as there is 120 mm fan blowing at vrms.Without that it's imposible to maintain 4.1 ghz frequency even on 1.26 voltage.Once Mobo temp reaches 50 celsius it trottle back at 1.4 and back up once it cools down
 
Joined
Dec 31, 2009
Messages
12,344 (4.07/day)
Likes
6,897
Location
Ohio
System Name Daily Driver
Processor 7960X 4.5GHz 16c/16t 1.17V
Motherboard MSI XPower Gaming Titanium
Cooling MCR320 + Kuplos Kryos NEXT CPU block
Memory GSkill Trident Z 4x8 GB DDR4 3600 MHz CL16
Video Card(s) EVGA GTX 1080 FTW3
Storage 512GB Patriot Hellfire, 512GB OCZ RD400, 640GB Caviar Black, 2TB Caviar Green
Display(s) 27" Acer Predator 2560x1440 144hz IPS + Yamakasi 27" 2560x1440 IPS
Case Thermaltake P5
Power Supply EVGA 750W Supernova G2
Benchmark Scores Faster than most of you! Bet on it! :)
#7
650w evga g2 or g3 is plenty for any single cpu and gpu overclocked and allow plenty of headroom. Hell, with a 1080 or lower, you could sli on 650w. ;)
 

CAPSLOCKSTUCK

Spaced Out Lunar Tick
Joined
Feb 26, 2013
Messages
8,579 (4.56/day)
Likes
18,432
Location
llaregguB...WALES
System Name Party On
Processor Xeon w 3520
Motherboard DFI Lanparty
Cooling Big tower thing
Memory 6 gb Ballistix Tracer
Video Card(s) HD 7970
Case a plank of wood
Audio Device(s) seperate amp and 6 big speakers
Power Supply Corsair
Mouse cheap
Keyboard under going restoration
#8
Guys what you say on these heatsinks for vrm? https://www.amazon.com/Enzotech-Mosfet-Passive-Copper-10-pack/dp/B004CL89D8
Also I'd like to take another power supply.Is it possible to find one that could last for few years and still be adequate for newer systems?
This way seems cheaper than buying new motherboard and even more when there is am4 on the market ....My oc is stable as long as there is 120 mm fan blowing at vrms.Without that it's imposible to maintain 4.1 ghz frequency even on 1.26 voltage.Once Mobo temp reaches 50 celsius it trottle back at 1.4 and back up once it cools down
Looks like youve answered your own question. When did you try the fan?
 

eidairaman1

The Exiled Airman
Joined
Jul 2, 2007
Messages
20,915 (5.30/day)
Likes
5,891
System Name PCGOD
Processor AMD FX 8350@ 5.0GHz
Motherboard Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory 16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s) AMD Radeon 290 Sapphire Vapor-X
Storage Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s) NEC Multisync LCD 1700V (Display Port Adapter)
Case AeroCool Xpredator Evil Blue Edition
Audio Device(s) Creative Labs Sound Blaster ZxR
Power Supply Seasonic 1250 XM2 Series (XP3)
Mouse Roccat Kone XTD
Keyboard Roccat Ryos MK Pro
Software Windows 7 Pro 64
#9
That motherboard is a bottom Barrel motherboard for Asus at this point I would get a 520 Watt seasonic and then slap fans on the Vrms. Otherwise you need to get a 990fx base motherboard from Asus the Sabertooth R 2.0 or 3.0, Crosshair 5, AsRock 990FX Extreme 4 or 6, Gigabyte 990FX UD3 or UD5- the Revision that @manofthem or @ThE_MaD_ShOt has

With what you said on noise and instability, have the motherboard tested if possible.

Otherwise replace both parts to avoid any other system damages.
 
Last edited:
Joined
Jan 17, 2010
Messages
10,477 (3.47/day)
Likes
7,250
Location
Oregon
System Name Delta // Alpha-HTPC
Processor Intel i7 6700K // Intel i5 4570
Motherboard GIGABYTE Z270X-Gaming K7 // Gigabyte H97M -D3H
Cooling Corsair H80i V2 // Silverstone NT-06 Pro
Memory Corsair DDR4 3000 32gb //G.SKILL Ripjaws X Series 8GB 1600
Video Card(s) EVGA GTX980ti// EVGA GTX 1050ti
Storage Samsung 950 Pro 512, 2 Tb FireCuda// Samsung 850 Pro, Synology NAS with 2X Toshiba 6Tb
Display(s) ASUS PB278Q 27" 1440X 2560 // 50" Samsung Plasma 720p
Case Corsair Obsidian Series 550D // Silverstone Granada GD05
Audio Device(s) ASUS Xonar DGX // HDMI to Yamaha RX V571
Power Supply Corsair TX850M // SeaSonic G Series 550w
Mouse Logitech G502
Keyboard Corsair K70
Software Windows 10 64bit // Windows 7 64bit with Kodi
#10
The VS power supply are bottom tier but still work just fine. Ive done two builds with no issues one was the vs450 the other vs550
 

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#11
Looks like youve answered your own question. When did you try the fan?
Well, it still rolls back at 3 ghz under prime95 if i don't turn on and off turbo core in amd overdrive .I tryed fan when i first got my current oc.Prime95 runed 10 hrs stable that way.

That motherboard is a bottom Barrel motherboard for Asus at this point I would get a 520 Watt seasonic and then slap fans on the Vrms. Otherwise you need to get a 990fx base motherboard from Asus the Sabertooth R 2.0 or 3.0, Crosshair 5, AsRock 990FX Extreme 4 or 6, Gigabyte 990FX UD3 or UD5- the Revision that @manofthem or @ThE_MaD_ShOt has

With what you said on noise and instability, have the motherboard tested if possible.

Otherwise replace both parts to avoid any other system damages.
Sorry I'm not sure what you mean by "have the motherboard tested it possible."
 
Joined
Jul 10, 2015
Messages
743 (0.73/day)
Likes
329
Location
Romania
System Name COFFEE LAKE | SKYLAKE | RYZEN
Processor i7-8700 | i5 6600K OC @4.5 GHz | R3 1200 OC @ 4.0 GHz
Motherboard MSI Z370 GAMING PRO CARBON | ASUS Z170-A | MSI B350 GAMING PLUS
Cooling NZXT Kraken X42 | HYPER 212 EVO | GAMAMAX 300
Memory CORSAIR LED 16GB DDR4 3000 | CORSAIR LPX 16GB DDR4 3000 | CORSAIR LPX 8GB DDR4 3000
Video Card(s) GTX 1080 Ti GAMING X | GTX 1080 GAMING X | GTX 1060 XTREME
Storage 960 EVO Series 250GB M2/ST2000DM006 | Corsair 120GB/ST1000DM003| HyperX Fury 120GB/ST1000DM003
Display(s) Predator XB1 XB271HU/Asus VG245H | AOC AG241QX/LG 22MP68VQ-P | BenQ GL2250HM
Case NZXT S340 Elite Matte Black |NZXT S340 Black | TESSERACT SW Black
Audio Device(s) ALC1220/Z906 |ALC892/Z533 |ALC892/Z533
Power Supply HX750W 80+ Platinum | CX750M 80+ Bronze | EVGA 650 GQ 80+ Gold
Mouse Logitech G502 | Genesis Krypton 700 | Genesis GX78
Keyboard Logitech G910 | Corsair K55 | Logitech G213 Prodigy
Software W10 Pro x64 | W10 Pro x64 | W10 Pro x64
#12
PSU can handle,even if is low rating/cheap,problem is with mobo/vcore/phases and cooling

Advise: Keep it default and see how is working or change psu/mobo/cpu for optimal performance,be aware that VS are not made for OC and stable amps.
 

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#13
PSU can handle,even if is low rating/cheap,problem is with mobo/vcore/phases and cooling

Advise: Keep it default and see how is working or change psu/mobo/cpu for optimal performance,be aware that VS are not made for OC and stable amps.
could amps be reason behind my gpu driver crashes?it works well only if i undervolt from default 1120 volts to 1022 or when core frequency is reduced by 10% which makes it run at around 990 volts based on gpu-z readings
also it says that pcie power outpu is 48 watts on gpu-z.could that be an issue?even tho ppl say that PCIe 2.0 x16 should be fine with 75 watt gpu
regarding cpu it runs at almost default voltage ranging between 1.248 -1.272 volts with average of 1.26 volts. default settings with amd turbo core pulls 1.4 volts and without turbo core it's not much less than my oc voltage.maybe i could lower it a bit but i doubt it would go below 1.2v
 
Last edited:
Joined
Jul 10, 2015
Messages
743 (0.73/day)
Likes
329
Location
Romania
System Name COFFEE LAKE | SKYLAKE | RYZEN
Processor i7-8700 | i5 6600K OC @4.5 GHz | R3 1200 OC @ 4.0 GHz
Motherboard MSI Z370 GAMING PRO CARBON | ASUS Z170-A | MSI B350 GAMING PLUS
Cooling NZXT Kraken X42 | HYPER 212 EVO | GAMAMAX 300
Memory CORSAIR LED 16GB DDR4 3000 | CORSAIR LPX 16GB DDR4 3000 | CORSAIR LPX 8GB DDR4 3000
Video Card(s) GTX 1080 Ti GAMING X | GTX 1080 GAMING X | GTX 1060 XTREME
Storage 960 EVO Series 250GB M2/ST2000DM006 | Corsair 120GB/ST1000DM003| HyperX Fury 120GB/ST1000DM003
Display(s) Predator XB1 XB271HU/Asus VG245H | AOC AG241QX/LG 22MP68VQ-P | BenQ GL2250HM
Case NZXT S340 Elite Matte Black |NZXT S340 Black | TESSERACT SW Black
Audio Device(s) ALC1220/Z906 |ALC892/Z533 |ALC892/Z533
Power Supply HX750W 80+ Platinum | CX750M 80+ Bronze | EVGA 650 GQ 80+ Gold
Mouse Logitech G502 | Genesis Krypton 700 | Genesis GX78
Keyboard Logitech G910 | Corsair K55 | Logitech G213 Prodigy
Software W10 Pro x64 | W10 Pro x64 | W10 Pro x64
#14
Stable amp and voltage is esential for cpu/gpu or else.. swap the psu and try
 
Joined
Dec 31, 2009
Messages
12,344 (4.07/day)
Likes
6,897
Location
Ohio
System Name Daily Driver
Processor 7960X 4.5GHz 16c/16t 1.17V
Motherboard MSI XPower Gaming Titanium
Cooling MCR320 + Kuplos Kryos NEXT CPU block
Memory GSkill Trident Z 4x8 GB DDR4 3600 MHz CL16
Video Card(s) EVGA GTX 1080 FTW3
Storage 512GB Patriot Hellfire, 512GB OCZ RD400, 640GB Caviar Black, 2TB Caviar Green
Display(s) 27" Acer Predator 2560x1440 144hz IPS + Yamakasi 27" 2560x1440 IPS
Case Thermaltake P5
Power Supply EVGA 750W Supernova G2
Benchmark Scores Faster than most of you! Bet on it! :)
#15
could amps be reason behind my gpu driver crashes?it works well only if i undervolt from default 1120 volts to 1022 or when core frequency is reduced by 10% which makes it run at around 990 volts based on gpu-z readings
also it says that pcie power outpu is 48 watts on gpu-z.could that be an issue?even tho ppl say that PCIe 2.0 x16 should be fine with 75 watt gpu
regarding cpu it runs at almost default voltage ranging between 1.248 -1.272 volts with average of 1.26 volts. default settings with amd turbo core pulls 1.4 volts and without turbo core it's not much less than my oc voltage.maybe i could lower it a bit but i doubt it would go below 1.2v
You are all over the place...

1. If pointing a fan at the vrm allows your clocks to stay high, then its obvious they need cooled and that is at least part of the issue.
2. Put cpu to stock and run gpu...does the driver still crash?
3. Put everything at stock and test...does it still crash?
4. As was said earlier, its likely one or the other. Because the motherboard isnt made for overclocking, we have no idea what is causing crashing under load. It could be the psu, it then that motherboard is also weak and may still throttle...you may buy another board amd the psu is bad.
5. Test the rails with a multimeter...
https://www.lifewire.com/how-to-manually-test-a-power-supply-with-a-multimeter-2626158
6. Amps matter, but the vs has enough to power that system, especially at stock.
 

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#16
Thank you guys for all the replys.I appreciate your time.
It helped me a lot and i made the choice.
Cheers!
 
Joined
Dec 31, 2009
Messages
12,344 (4.07/day)
Likes
6,897
Location
Ohio
System Name Daily Driver
Processor 7960X 4.5GHz 16c/16t 1.17V
Motherboard MSI XPower Gaming Titanium
Cooling MCR320 + Kuplos Kryos NEXT CPU block
Memory GSkill Trident Z 4x8 GB DDR4 3600 MHz CL16
Video Card(s) EVGA GTX 1080 FTW3
Storage 512GB Patriot Hellfire, 512GB OCZ RD400, 640GB Caviar Black, 2TB Caviar Green
Display(s) 27" Acer Predator 2560x1440 144hz IPS + Yamakasi 27" 2560x1440 IPS
Case Thermaltake P5
Power Supply EVGA 750W Supernova G2
Benchmark Scores Faster than most of you! Bet on it! :)

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#18
I will take better psu since it's component that could be used in future upgrades.I took look at 650w evga g3 and ppl complain about fan noise,probably better to look further. I'll also take this cooper mosfet heatsinks : https://www.amazon.com/Enzotech-Mosfet-Passive-Copper-10-pack/dp/B004CL89D8
Going to take risk with that so i can utilize more of my water cooling for a bit higher oc.
New mobo is just not an option since i don't intend to stick with am3+ when new motherboards are on the market.Thought to myself that it would be better to invest money from new am3+ mobo to better psu.
 
Joined
Dec 31, 2009
Messages
12,344 (4.07/day)
Likes
6,897
Location
Ohio
System Name Daily Driver
Processor 7960X 4.5GHz 16c/16t 1.17V
Motherboard MSI XPower Gaming Titanium
Cooling MCR320 + Kuplos Kryos NEXT CPU block
Memory GSkill Trident Z 4x8 GB DDR4 3600 MHz CL16
Video Card(s) EVGA GTX 1080 FTW3
Storage 512GB Patriot Hellfire, 512GB OCZ RD400, 640GB Caviar Black, 2TB Caviar Green
Display(s) 27" Acer Predator 2560x1440 144hz IPS + Yamakasi 27" 2560x1440 IPS
Case Thermaltake P5
Power Supply EVGA 750W Supernova G2
Benchmark Scores Faster than most of you! Bet on it! :)
#19
Lol, no fan noise on there. It has an eco mode. The fan wont even spin up with your pc man!

Edit: 750w has eco mode.. oops.. but i cant hear it all when it spins up....under full load.

Not sure if the psu will resolve your issues...but good to get those heatsinks and some thin thermal pads... it can only help until your mobo pops!
 

Waseni

New Member
Joined
Mar 17, 2018
Messages
7 (0.20/day)
Likes
0
#20
i hope it won't pop for another year or two :D I' ll try to squeeze max under 1.4 volts
should grant me 4.3 ghz at least
 
Joined
Dec 31, 2009
Messages
12,344 (4.07/day)
Likes
6,897
Location
Ohio
System Name Daily Driver
Processor 7960X 4.5GHz 16c/16t 1.17V
Motherboard MSI XPower Gaming Titanium
Cooling MCR320 + Kuplos Kryos NEXT CPU block
Memory GSkill Trident Z 4x8 GB DDR4 3600 MHz CL16
Video Card(s) EVGA GTX 1080 FTW3
Storage 512GB Patriot Hellfire, 512GB OCZ RD400, 640GB Caviar Black, 2TB Caviar Green
Display(s) 27" Acer Predator 2560x1440 144hz IPS + Yamakasi 27" 2560x1440 IPS
Case Thermaltake P5
Power Supply EVGA 750W Supernova G2
Benchmark Scores Faster than most of you! Bet on it! :)
#21
I wish you the best of luck, because, you will need it.

I honestly think a new board is worth it if you are going to keep it for a "year or two".
 

eidairaman1

The Exiled Airman
Joined
Jul 2, 2007
Messages
20,915 (5.30/day)
Likes
5,891
System Name PCGOD
Processor AMD FX 8350@ 5.0GHz
Motherboard Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory 16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s) AMD Radeon 290 Sapphire Vapor-X
Storage Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s) NEC Multisync LCD 1700V (Display Port Adapter)
Case AeroCool Xpredator Evil Blue Edition
Audio Device(s) Creative Labs Sound Blaster ZxR
Power Supply Seasonic 1250 XM2 Series (XP3)
Mouse Roccat Kone XTD
Keyboard Roccat Ryos MK Pro
Software Windows 7 Pro 64
#22
Well, it still rolls back at 3 ghz under prime95 if i don't turn on and off turbo core in amd overdrive .I tryed fan when i first got my current oc.Prime95 runed 10 hrs stable that way.



Sorry I'm not sure what you mean by "have the motherboard tested it possible."
Take it to a shop and have them test your motherbiard, cpu and psu with their known good parts, process of elimination.