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beginners question - overclocking decrease performance?!

post #1 of 11
Thread Starter 
hello,,
i've been trying to overclock an old AMD phenom 9750 non-BE CPU (yes i know..). i'm using AMD Overdrive and have pushed the HT ref clock from 200 to 225 (2.4Ghz to 2.7ghz)

the thing is, it doesn't matter in the benchmarks. i'm using PerformanceTest and the built in benchmark feature in overdrive. sometime, pushing up the clock give worse results! what gives?
post #2 of 11
hmm unfortunately, I cant say ive ever used either of those benchmarks before. I would try 3Dmark 11 to see if the score changes with that. That chip is a real pain to OC though, did you have to give it more voltage to get it stable?
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POLARIS
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post #3 of 11
Thread Starter 
acutally not at all. once i push it to 227/228 and do prime95 and battlefield 3 together it crashes after an hour. unless i give it 0.225V more. and you wouldn't believe my CPU Cooler - a Zalman CPNS7500... it's not even recommended for this phenom, only weaker models. max load reaches 60C temp after 20-30 minutes, and i decided to live with that. i have this rig for years now and i will keep pushing it.

anyway, can i be sure that if the clock reads more Ghz, then performance go up? i'll try 3dmark, but bottom line, that is what i want to know.

how can i tell when and if memory timing is keeping me back?
post #4 of 11
Quote:
Originally Posted by zartom View Post

acutally not at all. once i push it to 227/228 and do prime95 and battlefield 3 together it crashes after an hour. unless i give it 0.225V more. and you wouldn't believe my CPU Cooler - a Zalman CPNS7500... it's not even recommended for this phenom, only weaker models. max load reaches 60C temp after 20-30 minutes, and i decided to live with that. i have this rig for years now and i will keep pushing it.
anyway, can i be sure that if the clock reads more Ghz, then performance go up? i'll try 3dmark, but bottom line, that is what i want to know.
how can i tell when and if memory timing is keeping me back?

Well stability on AMD chips can be affected by temps as well. The max safe temp for amd chips is 62C, which you are getting very close to with your cooler. Seeing as how that is very hot, it could be causing instability, making your stress tests crash. In theory though, the more Ghz, the better performance in CPU dependant tasks, yes. I ask about your memory only because it can also be a source of instability. If you are running Prime95 blend, then that stresses the RAM a lot and if it is not stable, then it could also be a reason for the failed stress testing. I guess I just assumed you OCd your ram based on the fact that you have to use the FSB to overclock, Is that right? If so, what is your stock/recommened ram settings? Memory timings and speed wont affect performance much in the real world though.
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post #5 of 11
Thread Starter 
while all the info you gave is important, it's not my concern at the moment. maybe i didn't explain it good enough, but running in 225 HT ref is stabe. Prime95+Battlefield 3 or just prime95 run for 2 hours and more and maxing at 60C. yes i know it's hot, but as long as it's in the limits i'm going with it.
the only question at this point is why benchmarks are showing worse result with more Ghz compared to the stock HT ref. and if not worse, defentialy not far better.

i guess i should have seen something far above 60C for max load if it wasn't for my case. my case is pretty good compared to the other parts and before i had this case this very same CPU ran 60+ normally because of bad ventlation, bad dusty stock fan, bad dusty simple case and bad thermo paste. that was before i got into basic OC and hardware tinkering.
post #6 of 11

What is your motherboard?

post #7 of 11
Thread Starter 
GIGABYTE GA-MA790X-UD3P
post #8 of 11
Quote:
Originally Posted by zartom View Post

GIGABYTE GA-MA790X-UD3P

How did you stuff a DDR2 chip on a DDR3 board?
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post #9 of 11
Quote:
Originally Posted by Speced View Post

How did you stuff a DDR2 chip on a DDR3 board?

I believe it is a DDR2 board, my old MSI 790X only supported DDR2
POLARIS
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Red Alert SR-1
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CPUMotherboardGraphicsRAM
Intel 3570k 4.5Ghz 1.25v AsRock z77E-ITX XFX Reference 2GB 6950 1015/1500 1.255v 8gb Gskill Trident X 2400 C10 
Hard DriveCoolingOSMonitor
Samsung 830 128GB Ek Supreme HF White Acetal/EK FC 6970 Windows 7 Dell U2913WM 2560x1080 
PowerCaseMouseAudio
Cooler Master Silent Pro Hybrid 1050w Caselabs Mercury S3 Logitech G500 Fiio E10k USB DAC 
Audio
Creative Aurvana Live! 
CPUMotherboardGraphicsRAM
Phenom II 955 BE (4.4Ghz @1.52v) NB @ 2870 Gigabyte 990FXA-UD3 Rev. 1.1 [F4] Dual Reference XFX 2GB 6950s (950/1437) 1.25v 8GB Gskill DDR3 1333 CL7 @1412 
Hard DriveCoolingOSMonitor
Vertex II 60GB, 2x Caviar Black EK Supreme HF, EK FC 6970 Windows 7 Ultimate Alienware AW2210 1080p 
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POLARIS
(14 items)
 
Red Alert SR-1
(14 items)
 
 
CPUMotherboardGraphicsRAM
Intel 3570k 4.5Ghz 1.25v AsRock z77E-ITX XFX Reference 2GB 6950 1015/1500 1.255v 8gb Gskill Trident X 2400 C10 
Hard DriveCoolingOSMonitor
Samsung 830 128GB Ek Supreme HF White Acetal/EK FC 6970 Windows 7 Dell U2913WM 2560x1080 
PowerCaseMouseAudio
Cooler Master Silent Pro Hybrid 1050w Caselabs Mercury S3 Logitech G500 Fiio E10k USB DAC 
Audio
Creative Aurvana Live! 
CPUMotherboardGraphicsRAM
Phenom II 955 BE (4.4Ghz @1.52v) NB @ 2870 Gigabyte 990FXA-UD3 Rev. 1.1 [F4] Dual Reference XFX 2GB 6950s (950/1437) 1.25v 8GB Gskill DDR3 1333 CL7 @1412 
Hard DriveCoolingOSMonitor
Vertex II 60GB, 2x Caviar Black EK Supreme HF, EK FC 6970 Windows 7 Ultimate Alienware AW2210 1080p 
KeyboardPowerCaseMouse
Logitech Illuminated Corsair 650TX Cooler Master Storm Scout Logitech G9 
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Speced View Post

How did you stuff a DDR2 chip on a DDR3 board?

with a little force
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