molex to PCI-E connector for Radeon 7950

mattt* · Aug 18, 2012, 12:18 PM

Hello,

I have just ordered a 7950 to upgrade from my old GTX275 card. Before installing i need some advice. First of all, my PSU is an Antec Neo-He 550.

For now, i have only

- 1 x PSU connector to PCI-e cable
- 1 x PSU connector to 3 x Molex
- 1 x PSU connector to SATA drive connector.

+ of course the standard not modular motherboard connector.

My computer is quite old and i'm not the one who build it so atm, the cable provide power as follow :

- (1 x PSU connector to SATA drive connector) for my SATA hardrive 5400 rpm

- (1 x PSU connector to SATA drive connector) for the 1st PCI-e port of my GTX 275

- (1 x PSU connector to 3 x Molex) : 1st molex is plugged with a 1 x molex to 1 x PCI-e for the second port of my GTX275, 2nd molex to my DVD burner and 3d molex for 2 case fans.

I use my computer like this for 3 years without any problems, but after reading and earning knowledges about PC, i know that the 1 x molex to 1 x PCI-e connector is not a proper way to provide a clean energy to the GPU. Although, i read any things about a molex and i have seen that a single molex has a +12V cable, a +5V cable and 2 grounds cable, each with a maximum of 11A/pin. It means that the single yellow pin of a molex can provide 132W.

Here is my question, as the needed power for a MSI HD 7950 TF3 is 3*75W (PCI-e mobo slot + 2xPCI-e), is my single (1 x PSU connector to 3 x Molex) enough to provide power to 2 case fans (120mm + 80mm), 1 DVD burner and 1 molex to 1x PCI-e slot for my Radeon 7950 without burning ?

Should i wait to receive an extra (1 x PSU connector to 1 x PCI-e) before using my new GPU ?

Thanks.

AthlonX2 · Aug 18, 2012, 01:48 PM

I would buy a new psu with the proper connections. molex to pci-e are only meant for temporary use

hat · Aug 18, 2012, 02:37 PM

I have a Neo-He 550w as well, and mine has 2 pci-e connectors... did you lose some of your cables or something?

mattt* · Aug 18, 2012, 02:42 PM

Quote:

Originally Posted by hat

did you lose some of your cables or something?

Ye, that's why i have to use this "connecting solution" atm. I have contacted Antec, they can send me extra cables. But just for information, it would be good to know if the way my wire are connected is good enough or not because we can read plenty of different things everywhere on internet...

newtekie1 · Aug 18, 2012, 03:15 PM

Good enough, yes, but not ideal.

kajson · Aug 18, 2012, 03:22 PM

maybe you should consider underclocking it for a while, till you've upgraded/got the proper cables in place, chances are your system will bottleneck the gfx card anyways, and an underclocked 9750 will still blow away pretty much anything you throw at it.

I dont know how it's done with an ati card, i do know it can pretty easily be done with an Nvidia one anyways.

OneMoar · Aug 23, 2012, 12:18 AM

http://store.antec.com/Product/acces...5-30480-1.aspx 5 bucks
http://store.antec.com/Category/acce...are_parts.aspx

Aug 18, 2012, 12:18 PM	#1
mattt* Join Date: Aug 2012 Posts: 2 (0.01/day) Thanks: 0 Thanked 0 Times in 0 Posts	molex to PCI-E connector for Radeon 7950 Hello, I have just ordered a 7950 to upgrade from my old GTX275 card. Before installing i need some advice. First of all, my PSU is an Antec Neo-He 550. For now, i have only - 1 x PSU connector to PCI-e cable - 1 x PSU connector to 3 x Molex - 1 x PSU connector to SATA drive connector. + of course the standard not modular motherboard connector. My computer is quite old and i'm not the one who build it so atm, the cable provide power as follow : - (1 x PSU connector to SATA drive connector) for my SATA hardrive 5400 rpm - (1 x PSU connector to SATA drive connector) for the 1st PCI-e port of my GTX 275 - (1 x PSU connector to 3 x Molex) : 1st molex is plugged with a 1 x molex to 1 x PCI-e for the second port of my GTX275, 2nd molex to my DVD burner and 3d molex for 2 case fans. I use my computer like this for 3 years without any problems, but after reading and earning knowledges about PC, i know that the 1 x molex to 1 x PCI-e connector is not a proper way to provide a clean energy to the GPU. Although, i read any things about a molex and i have seen that a single molex has a +12V cable, a +5V cable and 2 grounds cable, each with a maximum of 11A/pin. It means that the single yellow pin of a molex can provide 132W. Here is my question, as the needed power for a MSI HD 7950 TF3 is 3*75W (PCI-e mobo slot + 2xPCI-e), is my single (1 x PSU connector to 3 x Molex) enough to provide power to 2 case fans (120mm + 80mm), 1 DVD burner and 1 molex to 1x PCI-e slot for my Radeon 7950 without burning ? Should i wait to receive an extra (1 x PSU connector to 1 x PCI-e) before using my new GPU ? Thanks.

Aug 18, 2012, 02:37 PM	#3
hat Maximum Overclocker Join Date: Nov 2006 Location: Ohio Posts: 12,247 (5.10/day) Thanks: 2,056 Thanked 2,045 Times in 1,555 Posts System Specs	I have a Neo-He 550w as well, and mine has 2 pci-e connectors... did you lose some of your cables or something? __________________ My Heatware “Inb4 smartphone LN2 overclocking.” -radrok

System Name:	Starlifter // Dragonfly
Processor:	(lapped) i7 920 4GHz 1.3v // 1090T 3.6GHz 1.3v
Motherboard:	Asus Rampage III // Gigabyte GA-770T-USB3
Cooling:	(lapped) Corsair H70 // (lapped) TT Big Typhoon
Memory:	3x2GB DDR3 1600 10-10-10-30-128-1T 1.5v // 2x2GB DDR3 1333 9-9-9-24-1T 1.5v
Video Card:	HIS Radeon 5870 // BFG Maxcore 55 GTX260
Hard Disk:	Plextor M5S 128GB + 512GB OCZ Agility 4 + 2TB WD20EARS // WDC Black 500GB
Optical Drive:	SATA DVD-RW // IDE CD-RW
CRT/LCD Model:	Dell/Alienware AW2310 + 19" HDTV // 19" HDTV
Case:	Antec SOHO 1030B // some really old white case... but it's decent
Sound Card:	Creative X-Fi Fatality Professional // onboard (disabled)
PSU:	Antec NeoHe 550W // Corsair CX600w
Software:	Windows 7 Home Premium x64 // Windows 7 Home Premium x64
Benchmarks:	zunn zunnzunn zunn zunn

Aug 18, 2012, 03:15 PM	#5
newtekie1 Semi-Retired Folder Join Date: Nov 2005 Location: Indiana Posts: 17,903 (6.47/day) Thanks: 785 Thanked 5,185 Times in 3,754 Posts System Specs	Good enough, yes, but not ideal. __________________ Rig1: System Specs. Rig2: A8-5600K@4.4GHz / AsRock FM2A75 Pro4 / 8GB Corsair DDR3-1600 9-9-9-24 / HD7560D / Samsung DVD-Burner / 1.5TB WD Green + 3x3TB WD RED in RAID5 Rig3: Athlon X2 4200+ / M4A79 Deluxe / 4GB G.Skill Pi DDR2-800 4-4-4-12 / GT430 / Sony DVD-Burner / 500GB WD Rig4: Phenom II x6 1605T @ 3.6GHz / Asus M5A99X Evo / 8GB PNY DDR3-1600 9-9-9 / GTX470 & GTX470 / Samsung DVD-Burner / 1.5TB Seagate

Processor:	Intel Core i7 875K@4.0GHz(200x20)
Motherboard:	eVGA P55 FTW 200
Cooling:	Thermalright Ultra-120 Extreme w/ Corsair SP120 High Performance Edition
Memory:	8GB Corsair DDR3-1600 7-7-7-20
Video Card:	ASUS GTX 670 4GB DirectCU II @ 1015/3600
Hard Disk:	1TB Seagate 7200.12(OS), 3x 1.5TB Seagate 7200.11 in RAID 5
Optical Drive:	Lite-On Blu-Ray Combo Drive IHES108
CRT/LCD Model:	HP 25" 2509m 1080p LCD
Case:	Lian-Li Lancool Metal Boned K7 w/ Windowed Side Panel
Sound Card:	Onboard is good enough for me
PSU:	Corsair HX850
Software:	Windows 7 x64 Professional

Aug 18, 2012, 01:48 PM	#2
AthlonX2 Better Than You Join Date: Sep 2006 Location: Toledo,Ohio Posts: 5,450 (2.22/day) Thanks: 730 Thanked 1,572 Times in 994 Posts System Specs	I would buy a new psu with the proper connections. molex to pci-e are only meant for temporary use

Aug 18, 2012, 03:22 PM	#6
kajson Join Date: Aug 2008 Posts: 135 (0.08/day) Thanks: 31 Thanked 25 Times in 21 Posts System Specs	maybe you should consider underclocking it for a while, till you've upgraded/got the proper cables in place, chances are your system will bottleneck the gfx card anyways, and an underclocked 9750 will still blow away pretty much anything you throw at it. I dont know how it's done with an ati card, i do know it can pretty easily be done with an Nvidia one anyways.

System Name:	"the strong silent type"
Processor:	i5 3570k
Motherboard:	Asus Maximus V Gene
Cooling:	Thermalright Archon
Memory:	G.Skill RipjawsX D3 8GB 1866-899 RipjawsX K2 GSK
Video Card:	XFX 6950 1GB dualfan
Hard Disk:	Crucial M4 128GB / Samsung F3 HD103SJ 1TB
CRT/LCD Model:	LG W2253V
Case:	CM 690 II Advanced
PSU:	Coolermaster Silent Pro Gold 600w
Software:	Win 7 Ultimate 64bit

Aug 23, 2012, 12:18 AM	#7
OneMoar Banned Join Date: Apr 2010 Posts: 2,345 (2.01/day) Thanks: 91 Thanked 442 Times in 380 Posts System Specs	http://store.antec.com/Product/acces...5-30480-1.aspx 5 bucks http://store.antec.com/Category/acce...are_parts.aspx

System Name:	Waiting For Haswel
Processor:	Phenom II @ 4.0Ghz @ 1.480v 2600NB/1.25v
Motherboard:	MSI 990XA-GD55
Cooling:	Mugen RevB
Memory:	8GB DDR3 @ 1600
Video Card:	ATi 6870 @ 940/1100
Hard Disk:	WDBLUE 250GB && WD BLACK 500GB
Optical Drive:	x1 DVD
CRT/LCD Model:	HP w2071d
Case:	NZXT GAMMA
Sound Card:	RealtekHD
PSU:	Antec 520c
Software:	Windows 7 x64

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