Overclock feedback Please

January 22, 2009 at 10:24:29
Specs: Windows XP, Athlon 64 X2 4200+

I just completed my first overclock and I need some feedback on how I did and If I can can do better!

For reference, I followed the steps in THIS guide exactly.

CPU: AMD Athlon 64 2X Windsor 4200+ 2.2 GHz(it is the 89 Watt version)
RAM: DDR2 667mhz (3x1gb) – I know I should be using better but for now, it is what it is.
Mother Board: Gigabyte GA-MA770-UD3
Graphics: EVGA e-GeForce 9800 GTX+ (512MB)
Power Supply: 600w Rosewill

Part 1 - I started by finding the motherboard limit.
ref clock: 200
CPU mult: x5
HT mult:x5
vCore: 1.35v
Mem: DDR2 400
Timing: 5-5-5-18-26-2t
vDIMM: 1.8v

I was only able to get to 250MHz which i felt was kinda low. I never had to reduce the HT multiplier. At 255MHz, system wouldn't start at x4 or x3 HT multiplier. I didn't bother increasing the motherboard voltage.

Not sure if this was normal but, during this test the vCore was reading very low...like below 1v. I guess the system was dialing down the voltage because the CPU speed was so low? Could that have been a problem?

Part 2 - Anyway, on to the CPU.

ref clock: 200
CPU mult: x11
HT mult:x5
vCore: 1.35v
Mem: DDR2 400
Timing: 5-5-5-18-26-2t
vDIMM: 1.8v

I got to a ref clock of 240 on 1.35v. At 245, I had to bump it to 1.3725. At 250, the system failed at 1.4v,1.425v,1.450v,1.4725v, or 1.5000v. However, the system did stay on longer as i increased voltage. I'm guessing it wouldn't take much more to get the system stable at 250MHz. Temps were fine at 1.500v: 32 idle, 46 orthos stress test. (I double check my temps using two separate programs)

HT multi stayed at x5, reducing didn't help.

So, to be safe I settled with 240MHz and bumped up the vCore to 1.3725v for stability. Temps were fine, 29 idle and never above 43 during orthos stress test.

Part 3 - Memory

I don't have really good memory. Its stock from an HP system that I had. I changed the Bios to DRR2 533 and the timings to 5-5-5-15-26-2T and it runs fine. I didn't really mess with it.

I thought it was strange that I couldn't get the system to go over 250Mhz..

I also thought it was strange that increasing the vCore didn't really help the cpu at all.

At 240Mhz/x11/DDR2533 my memory gets underclocked to 587MHz...which sorta blows. I don't really want to reduce the cpu multiplier and I dont think it will do well overclocked so I guess I'm just stuck with slow memory.

So, I went from a 2.2GHz processor to a 2.64GHz processor.

See More: Overclock feedback Please

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January 22, 2009 at 11:57:36
You should ALWAYS reduce the HT multi when increasing the ref clock. Take out one stick of RAM...that 3rd stick is most likely forcing the memory to run in single channel mode. Then try this:

ref clock: 250
CPU mult: x10
HT mult:x4
vCore: 1.40v
Mem: DDR2-533

This will put the CPU at 2.5GHz, HT bus at 1000MHz & RAM at 667MHz. If you have no problem running with these settings, try changing the CPU multi to x11. If it works, the CPU will be at 2.75GHz & the HT bus will stay at 1000MHz, but the RAM will drop off to about 647MHz (611MHz according to your chart). To get the RAM to run at 667MHz, you'd have to increase the ref clock to 257MHz.

Also, the memory will perform better with the command rate set to 1T but it *may* cause instability. You won't know until you try. 2T is more stable but it's slower.

And always disable Cool 'n' Quiet, all Spread Spectrum settings & make sure to lock the PCIe bus at 100MHz.

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