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1090T @ 4Ghz with 1.35v?

post #1 of 22
Thread Starter 
Gents,

I've started to OC my CPU and have managed to reach 4.0Ghz with VCORE set as 1.35v in the BIOS (The computer would also boot to around 1.32v when the VCORE was set to Auto but I figured it would be unstable under load which is why I manually set it to 1.35v). When the core undergoes load in Prime95 (small FFT test) Vcore jumps to 1.39v which I assume is because of Load Line Calibration.

Anyway I ran Prime95 for 4 hours and no error came up. I still have a nagging suspicion that 1.35v is a little low since I keep hearing others on this forum saying that 1.4v is the sweet spot.

To achieve this OC I simply raised the multiplier to 20 (FSB=200).

1. Is 1.35v too low? Perhaps I should run prime for 8+ hours. Under load CPU reaches around 54 in Prime95 and 40's in gaming.

2. I stuck with raising the multiplier alone since when I raised my FSB to 250 my Metro 2033 bench didnt change FPS value much. Should I raise my FSB to 250? instead of just upping the multiplier.

Thanks
Unicron
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Unicron
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post #2 of 22
Ignore benches in games, that's not a good identifier of either speed or stability for a CPU.

Stick with prime95 and Intelburntest for processor stability. IF you can undergo 20 runs of IBT at maximum and 6 hours of prime you're stable.

You probably got a good batch, hence the low Vcore requirement.

Comps
post #3 of 22
1.35v isn't too low because it's really 1.39v under load. (Which doesn't really matter your voltage can only be too low if you're failing stability tests)

It doesn't matter if you use fsb or multi, but you should overclock your cpunb to at least 3GHz as well as use some fsb to increase that nice ram of yours up over 1600 at those timings.
    
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post #4 of 22
Maybe you have a really good chip. Run prime 95 for at lease 12 hours, there run 50 passes of LinX, Linx test my CPU much harder and finds problems faster as well. 50 passes will take about 20 minutes.
post #5 of 22
Thread Starter 
Cheers, +Rep for all,

I will use Prime95 for longer, I will also run LinX and IBT.

Regarding my other BIOS values they all remain at Auto. I guess I will try get the NB to 3Ghz with NBv of 1.3v

Balla, Unfortunetaly I had lots of trouble with my ram trying to reach 2000mhz at its rated timmings so i stuck with my current values which Im happy with.

What is a good rounded figure for a higher FSB? 250 good enough? I dont intend to go super crazy!
Unicron
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Unicron
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post #6 of 22
Do not pas 1.45V on CPU/NB just saying
Then use Memtest to test your ram after you have done Overclocking that.
post #7 of 22
With a 1090t I think you should be ok just overclocking on teh multiplier tbh, i'm by no means an expert on OC'ing AMD's though.

Comps
post #8 of 22
Quote:
Originally Posted by compuman145 View Post
With a 1090t I think you should be ok just overclocking on teh multiplier tbh, i'm by no means an expert on OC'ing AMD's though.

Comps
As he said just stick with the multi. FSB will increase the speed of everything for you, from ram to Northbridge to the CPU. etc.. Don't use that just overclock everything one by one to experience superior stability.
post #9 of 22
Quote:
Originally Posted by sbsolarski View Post
Cheers, +Rep for all,

I will use Prime95 for longer, I will also run LinX and IBT.

Regarding my other BIOS values they all remain at Auto. I guess I will try get the NB to 3Ghz with NBv of 1.3v

Balla, Unfortunetaly I had lots of trouble with my ram trying to reach 2000mhz at its rated timmings so i stuck with my current values which Im happy with.

What is a good rounded figure for a higher FSB? 250 good enough? I dont intend to go super crazy!
Nah I don't think having a rounded number for FSB matters, just get what you can from it. Usually I used to just bump it up around 222 or so after using my multipliers to get everything else lined up. The idea of having a BE chip is that you have an unlocked multiplier to hit the exact speeds you're trying to hit.

Don't worry about ram MHz too much on a AMD system, 1600 is fast enough focus on tight timings (which you have). If anything return the cpu to stock and see how far you can take the ram at 6-6-6, then figure out your cpu and nb multi based on what your fsb needs to be to max out your ram.

Raising the cpuNB will give you better performance from the ram.
    
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post #10 of 22
Thread Starter 
Just ran 20 passes of LinX and found no problem. Peak Gflops at 72.1034, Guess I should do 50 runs.

Balla I think I'll just leave my RAM as is, in saying this I will make sure the ram value is around 1600mhz if I raise my FSB.

EDIT: Balla when you say cpuNB are you saying that raising the NB to say 3ghz will yield more benefit for the ram?

Socks, regarding your comment about leaving FSB, so far thats what I've done, I've OCd the RAM individually and may as well up the NB to 3.0ghz @ 1.3v by itself too. Thats what your implying yes?
Edited by sbsolarski - 4/27/11 at 4:58am
Unicron
(15 items)
 
  
CPUMotherboardGraphicsRAM
PII 1090T BE @ 4.0Ghz Asus Crosshair IV Formula 2x ATI ASUS 6970 CF 1600mhz 8-8-8-24 @1.5v 
Hard DriveOptical DriveCoolingOS
250Gb Samsung EVO 840 Pioneer DVD-RW Corsair H80 Windows 7 64bit 
MonitorKeyboardPowerCase
AOC q2770pqu Steelseries 7G HX1000W Corsair Antec 1200 
MouseMouse PadAudio
ROCCAT Kone Military Pure DOTA 2 Steelseries QCK ASUS Xonar Essence STX 
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Unicron
(15 items)
 
  
CPUMotherboardGraphicsRAM
PII 1090T BE @ 4.0Ghz Asus Crosshair IV Formula 2x ATI ASUS 6970 CF 1600mhz 8-8-8-24 @1.5v 
Hard DriveOptical DriveCoolingOS
250Gb Samsung EVO 840 Pioneer DVD-RW Corsair H80 Windows 7 64bit 
MonitorKeyboardPowerCase
AOC q2770pqu Steelseries 7G HX1000W Corsair Antec 1200 
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