6990 Mining Blues

[c4n10]

Another thought:

Also try disabling crossfire if it is enabled...

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[jamal]

Hey!

ULPS disable, crossfire is disabled (no option to enable; greyed out)
BIOS settings have been checked

I thought maybe it was PSU but why would a lack of power prevent you from underclocking the memory?

Playing with the power  (0-20) did allow me to underclock the memory but my core dropped to 200 mhz as well.

[c4n10]

Hey!

ULPS disable, crossfire is disabled (no option to enable; greyed out)
BIOS settings have been checked

I thought maybe it was PSU but why would a lack of power prevent you from underclocking the memory?

Playing with the power  (0-20) did allow me to underclock the memory but my core dropped to 200 mhz as well.

Well, I suggested the PSU as a problem more to address your throttling issue rather than the memory underclock issue.

I don't think this is your problem, but is your 7770 blowing it's exhaust directly onto the 6990...? If so, try switching their slots or moving them 1 -2 more slots apart...

And if THAT doesn't work then I think and I feel pretty confident that your problem is the PSU not having enough wattage to cover both your 7770 and 6990 at the same time. Try removing the 7770 and see if your problem improves. If it does, go for a bigger power supply.

Your 7770 requires at minimum a 500w power supply and the 6990 requires a 650w power supply, the two together just may be overwhelming your 850w power supply.

[kwoody]

850w should be fine for powering a 7770, 6990, quad-core CPU, mechanical hard drive, and you should still have some wattage to spare.
One of my rigs is an i7-920 130W cpu, 6950 2gb with unlocked shaders, and a 5830. Running perfectly fine on a Corsair 750w 80+ bronze PSU for over a year now.

[Kaliecious]

are you using msi afterburner?
what driver set you have?

and as to  the heat, I called msi, this cards have been rated up to 99c.. ive tried undervolting but it acts up. my hotest gpu is about 96-98c im over clocked to 915 ram at 625 and with a fan mine mine 24/7 no problems.

...Call us in a month and let us know if they're broken 

If that is the case I should have called almost a year ago, The cards run like a champ..

This is a problem I did expiernce though. On the computer I am using right now I have a 6990 running as a slave mining, It sould not pull enough cool air becuase it was right above PSU, I put a small 5inch fan in front of it and it solved my problems. The card would mine, but the mhash would sometimes go to 200 and then back up to 395. try a fan in front just to see what happens.

[jamal]

Thanks for the advice, but temps are no longer an issue. Just need to find how to underclock memory, managed to underclock one core down to 750 (lowest it would go) but not the others. Tried to underclock them independently and synchronized, in both cases only one core underclocks (same core in both cases)