PSA: Malta 7990s are NOT suitable for mining!

[dogie]

Very nice results. This card seems very impressive in comparison to the 3-slot 7990s. It's nearly unbelievable they managed to get the cooling to work that well on it.

Do you have any VRM noises at any clocks or volts?

Yep dogie was a complete moron for not physically comparing both cards.  He rather created a thread based on speculation of the old 7990 hardware that is 1+ year old and now he looks like a jackass.  Now hes mad to the point that he is trolling people's threads like a degenerate.   (degens gonna degen.)

As of this post the Sapphire 7990 Malta seems to be the most stable card as far as temps, clock, power usage, etc.

I can get 1260mhash/sec stable; even up to 1300+mh/sec while bitcoin mining; using msi afterburner; stock cooling only.
ROI on this card is 5-6.2 months.

I'm sure I can sell it for a pretty penny after mining a bit of btc as well.

With it all said the 7870 tahiti LE, 7950, 7970, 5870 5970 cards seem to be the best for ROI; this card does OK in that realm.

What are you talking about? No one took you up on your shit blade off because... it was shit.

Lol, the thing you do not get in your head is you keep failing when you keep assuming stuff.   The 7990 Malta thread that you created = Fail because you never had the hardware.  You still do not have the 7990 Malta hardware.  Imagine how much of a dumbass people think you are now that they are posting real  7990 Malta results that put your assumptions to shame?   Trolling on my asicminer group buy threads = Fail.  I have ~750 BTC of interest.  Why do you even try?

The thing i don't get is why you go through such depths to say nothing useful on people's threads.  In fact you would rather troll, be negative and contribute nothing productive or useful to the community.
If you do this in real life you will not be very successful. 

dogie gonna degen and degens gonna degen.

Crying going to cry more. I have interest from the president for me to run the world, doesn't mean its happening.

Oh and assumptions... you keep saying your Maltas are better than the 3 slots. How many 3 slots do you have? None. So using your logic = fail because you never had the hardware.

[rahrahrah]

We have 1 system with 2 x 7990 in (Gigabyte GV-R799D5-6GD-B) and we're having an absolute nightmare with cooling. Open rig at room temp, additional fans, and a guy with a degree with thermodynamics and fluid engineering helping to maximise airflow.

The second GPU on each card seems to run hotter than the first. The second GPU on the card further inside the (open) case cooks; it climbs to over 90 quite quickly every time, and we've seen a peak of 101. At these high temps the system crashes. Even running cgminer and disabling that GPU doesn't help (the temp still goes up!). We've tried various cgminer settings from I12 to I13, with -g1 to -g2 and threadconcurrency of 8192, 14336 and higher. Nothing is workable at the moment, though we'll try a lower intensity later today. Dropping from I13 to I12 though does result in a loss of around 400kH/s which is quite a lot over the course of a full day/week/month...

Next step is to try going to try replacing the thermal paste with something higher rated.

It's very frustrating because I personally have another 6 cards and 3 rigs to build... or not (and send it back). The only help with the additional rigs is that they'd be in a garage outside with an air temp of ~15 lower (throughout winter at least).