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X2 550 BE C2 - Attaining 4GHz?

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#1
My C2 revision Phenom II X2 550 Black Edition will do (200x19=)3.8GHz stable at 1.5v with temps under 40c. I can POST and occasionally boot at 3.9GHz, but it usually isn't stable for long. I've tried bumping core voltage up to 1.6v with absolutely zero improvement in stability (temps reach ~55c). I've bumped miscellaneous voltages to try to improve stability, but it seems that nothing helps.

I know 3.8GHz is about where I should be at on an older C2 stepping, but can anyone explain what's stopping me from going any higher? (..and/or tell me what's safe as far as voltages go?)

Hardware at a glance:
Phenom II X2 550 Black Edition
DFI LanParty DK 790FXB-M3H5 (SB750) (10/9/2009 BIOS, latest)
Xigmatek S1283, OCz Freeze, Scythe Ultra Kaze 3000
<-- Check sig for the rest

Current BIOS settings:
CPU Core Voltage - 1.53v
DRAM Voltage - 1.8v
SB PLL - 1.2v (tried 1.3)
NB Core Voltage - 1.2v (tried 1.35)
NB PCIE Voltage - 1.12v (haven't bumped)
NB HT Voltage 1.27v (tried 1.4v)
CPU-NB Voltage - 1.25v (tried 1.4v)

CPU NB Clock Ratio - x13 (will not do x14 for anything)
HT Link Frequency - 2.6GHz (2.6 seems to be the max)
CPU Host/HTT Clock - 200MHz
CPU Host/HTT Adjust Gap - 5MHz
PCIE Clock - 100MHZ
 
Joined
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System Name Main PC
Processor PII 925 @3.724GHz (266x14) 1.525v NB 2660 1.425v
Motherboard Gigabyte AM3 GA-890XA-UD3 (790x+SB850)
Cooling Scythe Mugen 2 rev.B
Memory Hyperx 8GB (2x4) 1600@1418 8-7-7-20-27-1t
Video Card(s) Sapphire 6850 Stock (Max Overclock 1030/1200)
Storage 1x1TB WD Green / 1x1TB Seagate
Display(s) LCD Samsung 24" 16:9
Case Cooler Master HAF 912
Audio Device(s) On-Board HD
Power Supply CM 750w GX |3.3v@25a|5v@25a|12v@60a
Software Windows 7 Ultimate 64bit
Benchmark Scores later...
#2
My PhenomII x4 C2 wont go over 3.850Ghz @ 1.550v stable no matter what i do , so i keep it at 3.836Ghz with 1.525v

I doubt you can get much more... did you try unlocking to an 4 core?
 
Joined
Nov 10, 2006
Messages
4,529 (1.11/day)
Likes
6,082
Location
Washington, US
System Name Lappy
Processor i7 6700k
Motherboard Sager NP9870
Cooling A lot smaller than I'd like
Memory Samsung 4x8GB DDR4-2133 SO-DIMM
Video Card(s) GTX 980 (MXM)
Storage 2xSamsung 950 Pro 256GB | 2xHGST 1TB 7.2K
Display(s) 17.3" IPS 1080p G-SYNC
Audio Device(s) Sound Blaster X-FI MB 5, Foster 2.1 channel integrated
Power Supply 330w Brick
Mouse Razer Deathadder
Keyboard 3-zone RGB integrated
Software Windows 10 Pro
Benchmark Scores Not slow
#3
I've tried everything except underclocking. No 4 cores for me. :(
 
Joined
Jun 13, 2009
Messages
1,528 (0.49/day)
Likes
324
Location
Canada/Québec/Montreal
System Name Main PC
Processor PII 925 @3.724GHz (266x14) 1.525v NB 2660 1.425v
Motherboard Gigabyte AM3 GA-890XA-UD3 (790x+SB850)
Cooling Scythe Mugen 2 rev.B
Memory Hyperx 8GB (2x4) 1600@1418 8-7-7-20-27-1t
Video Card(s) Sapphire 6850 Stock (Max Overclock 1030/1200)
Storage 1x1TB WD Green / 1x1TB Seagate
Display(s) LCD Samsung 24" 16:9
Case Cooler Master HAF 912
Audio Device(s) On-Board HD
Power Supply CM 750w GX |3.3v@25a|5v@25a|12v@60a
Software Windows 7 Ultimate 64bit
Benchmark Scores later...
#4
No 4 cores for me. :(
Been there twice Sempron 140 & PIIx2 560 didn't unlock , it's sucks!...:mad:

The Sempron unlocked & booted as a dual core but froze at Bios post no matter what i've tried...
Anyhow i exchange it for a real dual core the AIIX2 240 & later on move to my PIIx4 now waiting for bulldozer or go for a PIIx6 , it will all depend on performance & the price tag...;)

As for the PII x2 560 (C3) it overclock pretty good got 4.1Ghz stable @ 1.450v , it was for a friend of mine & he is quite happy with it , in games there is no real difference between his dual core & my quad core (1-2fp/s max) but in benchmarks i am kicking ass all over his dual core...:D:laugh:
 
Last edited:
Joined
Nov 10, 2006
Messages
4,529 (1.11/day)
Likes
6,082
Location
Washington, US
System Name Lappy
Processor i7 6700k
Motherboard Sager NP9870
Cooling A lot smaller than I'd like
Memory Samsung 4x8GB DDR4-2133 SO-DIMM
Video Card(s) GTX 980 (MXM)
Storage 2xSamsung 950 Pro 256GB | 2xHGST 1TB 7.2K
Display(s) 17.3" IPS 1080p G-SYNC
Audio Device(s) Sound Blaster X-FI MB 5, Foster 2.1 channel integrated
Power Supply 330w Brick
Mouse Razer Deathadder
Keyboard 3-zone RGB integrated
Software Windows 10 Pro
Benchmark Scores Not slow
#5
My girlfriend has, I think, an i7 920 (stock) and it kicks my butt as far as file compression/decompression goes.