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Results from volt-mod not as expected - Page 2

post #11 of 26
Did you check with a multimeter to make sure you really got it to that voltage? Any 7900 core should hit at least 700Mhz stable at 1.55V. I had mine running at 730Mhz without a single artifact in ATiTool, with a little more room for 735Mhz. That temperature is a little too low for 1.55V, since mine was at high-50's degrees under artifact scan, but that was during summer so oh well.
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post #12 of 26
Thread Starter 
Well, I've not been able to successfully test the voltage, as I can't find a decent ground; what would you suggest?

Vmem should be ok, as I measured the resistance, and it matched up to what it should be.

Yeah, it's mid-November here, and fairly cold.
post #13 of 26
You should be able to get a "good enough" ground somewhere on the steel case. Otherwise use one of the two black wires in a power connector from your PSU.

In my previous post I meant lower your RAM voltage, and RAM clock. That modest bump in RAM Mhz wouldn't change your scores too drastically, anyway, but could hurt stability.
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post #14 of 26
Thread Starter 
I'm currently getting 1.55vCore and 2.2vRam.

Yeah, I may as well at least drop the vRam a bit. Let's see if setting it back to stock will get 3DMark06 working as it should.

EDIT: Used my TIM remover to get all graphite off. Ran 3DMark06 at stock clocks, and it's worse than it was when I first ran 3DMark06 with this card (get 7/8 fps on the firefly test, when it usually ran smoothly).

Also, ATI Tool test gets artifacts on stock clocks:


What the hell have I done?
post #15 of 26
Thread Starter 
Bizarre. Went into Rivatuner, see if that would let me overclock. Clocks were at 600/900, and it didnt like 600, so I went to open ATI Tool to set clocks to default, and it crashed. (That crash where you hear that beep, like when someones heart stops beating).

Restarted, opened up ATI Tool, checked for artifacts at 600/900, and I no longer get that yellow-dotted-stuff that appears in the pic above.

Will proceed to overclock tomorrow. Fingers crossed.
post #16 of 26
Good luck with it
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post #17 of 26
Thread Starter 
Well, I have no idea what happened last night, but it's still playing up. Could it be down to me handling it too much, and leaving too much oil and stuff on the card from my fingers?
post #18 of 26
Run 3dmark06, and see if it crashes on you. This sounds alot like the problem people were having with the 7900's prior to them becoming ROHS compliant. How old is this 7900?
post #19 of 26
Thread Starter 
Quote:
Originally Posted by thealmightyone View Post
Well, I dropped my core clock AGAIN, to 600MHz (before the volt mod, it was 590MHz, and the memory was the same as it is now - 900MHz). I now get 3901, which is a drop from 3949, and nowhere near 4500, which I had before the mod.
Re-ran 3DMark06, on 600MHz Core and 900MHz Mem, and I now get 3750. ***?

It just seems that, after the mod, I get an all-round reduction in fps, and those yellow dots in ATI Tool artifact test. It's just the cause that is unknown.

I got this card mid-June, this year.

EDIT: I'm going to take the card out, clean ALL of the back of the PCB, carefully cut some notches in the silver ink to disable the mod, and see if I get the score I had before the mod.

EDIT: Well, that did bugger all.

EDIT: Decided to try reinstalling drivers, and that SEEMS to have worked. 3DMarl06 runs as smoothly as it used to, ATI Tool is happy at stock clocks. Lets just see how it goes before repairing the volt mod.
post #20 of 26
Thread Starter 
Ok, I am 99.9% sure that the problem is down to bits of pencil lead getting where it shouldn't.

I've cleaned the vMem resistor, and the area around it, 3 time so far with my 'Citrus-based solvent' TIM cleaner. As I did blow while doing the vMem mod, it's possible the lead could have got anywhere on the left-hand side of the rear of the card.

Is it safe to clean my card in lots of water, after leaving it disconnected from power overnight, and giving it lots of time to dry?

Or, is there another cleaning liquid I can use that will actually get the graphite off?
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