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Do I NEED a bigger PSU.

post #1 of 26
Thread Starter 
I already have an EVGA Supernova 850 B2. I thought it was more than enough, but my plans have changed along the way.

The computer is an LGA775. This is what I planned for.
QX9650 at 4.2GHz.
8GB DDR2 800 (16GB, or DDR2-1066 might happen later)
3x 120GB SSD in RAID 0, and 320GB HDD backup in RAID 1
1 DVD-R
2- HD6970 Crossfire (I already had these).
Maybe a PCI sound card
Maximum fans 3x Delta 1.8A ( at least 2, 1case, 1 CPU) 65W total at full speed which never really happens (except validation runs with no GPU load). It's a BTX workstation so anything less would be a downgrade.

The GPU setup seems a little light for nowadays (1080p only).

So I'm considering getting an HD6990 to Crossfire with one HD6970. I have 2 PCIe 16x slots. ( can run 16x, 16x or 16x,8x,8x).

It's a pretty big change. since the GPUs a,nd CPU don't max. out at the same time can this work? Worst case scenario would probably be running 3D Mark Firestrike, or the Unigine Heaven/Valley benchmarks. I saw some Trifire tests that drew 717W from the wall. But without the RAID, or Delta fan settup.
Edited by Retrorockit - 6/11/16 at 9:13am
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post #2 of 26
717 watts from the wall is not 717 watts used by the system as you have to take the rated efficiency of the PSU off the number from the wall.
If the PSU is an 80 plus gold rated unit the efficiency is up to 90% which means the power draw would be 645 watts not 717 watts.
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post #3 of 26
Thread Starter 
EVGA according to Johhnyguru, tend to test at silver level for their bronze PSUs. It sounds like it might be worth trying it and see what happens.
What would be the signs of a PSU limit as opposed to too aggressive an overclock? BTW thanks for the quick reply even though I was away from the computer it's appreciated.
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post #4 of 26
If you push the PSU too far it should just shut off unless its either too cheap to have any safety on it or the safety is not working.
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post #5 of 26
Not to comment on the PSU, but getting a 6990 to CFX with the 6970? Why? CFX is always buggy. How much is the 6990? You would be better off selling the 6970s and getting a single GTX 1070. Much less power and heat, less noise, and less driver issue.
post #6 of 26
Thread Starter 
I can get HD6990 for $215. At 1080p the 2GB/CPU memory should be OK. I could sell 1- 6970 so say $115 out of pocket. As far as buggy goes I just benchmark old hardware for fun. I'm retired and have time to play with things. I'm not looking for the "Leggo" experience. The computer I'm building is a ten year old Dell BTX workstation with a locked BIOS. AMD just released new Crimson drivers for the 5xxx, and 6xxx cards last month. If I buy the new card and stick it in and it runs great I've spent $450 and 1/2 hours time. Then what? I like to take things that nobody wants anymore and see how fast I can make them go. Retro (old) rockit (rocket for fast). It's what I do.

Look at the 2006 Dell E520 in my sig. Dell says maximum supported Q6700 4 Gb DDR2 667. Locked BIOS supposedly can't be overclocked. I've had it to 4 GHz quad core(link in sig). It's made for a single slot GPU. I've got an R9-285 in mine. I used a $10 surplus Dell heatpipe cooler and a $25 Delta server fan. If you click on the image in the link you'll see how my result compares to others using the QX6800.

Also if my CPU bottlenecks this setup I can remove 1/3 of it. That would be hard to do witha 1070.
Edited by Retrorockit - 6/12/16 at 8:58am
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post #7 of 26
Thread Starter 
Back to the PSU question. These old Dells use the 5V. bus a lot more than newer computers. The Dell PSUs list 22A. there, and my EVGA 850 has 24A. This may leave more 12V. power for the GPUs than a newer build might have. I certainly hope so. It's not very often that having an old Dell actually works in my favor.
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post #8 of 26
Not sure where you're looking, but $215 for a 6990 is a terrible deal. I wouldn't even pay $100 for one.

For $215 you can easily get a 290X, 780 Ti, or 970. Also, a used 6970 won't sell for more than $50.

I would absolutely avoid Trifire on old GPU's.
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post #9 of 26
Quote:
Originally Posted by iinversion View Post

Not sure where you're looking, but $215 for a 6990 is a terrible deal. I wouldn't even pay $100 for one.

For $215 you can easily get a 290X, 780 Ti, or 970. Also, a used 6970 won't sell for more than $50.

I would absolutely avoid Trifire on old GPU's.
+1. Not even sure why you want to tinkle with CFX that way. Game play will be terrible. It is money wasted for sure.
post #10 of 26
Quote:
Originally Posted by iinversion View Post

Not sure where you're looking, but $215 for a 6990 is a terrible deal. I wouldn't even pay $100 for one.

For $215 you can easily get a 290X, 780 Ti, or 970. Also, a used 6970 won't sell for more than $50.

I would absolutely avoid Trifire on old GPU's.

Was about to post this. The 6990 at that price might as well be called a scam... Besides even a single 7970ghz/280x is faster than two 6970' as is... adding a third won't help tremendously. A 290x would beat that setup big time in all games and also offers 4gb of vram vs the very limiting (in current games) 2gb the 6970's have.

And being that the RX480 is out in a few weeks and should be around 390 / 390x performance atleast (from everything known so far) and release at 199-$250 (8gb will be $250 at most and 4gb at $199, again from what has been 'confirmed'.) while also consuming way less power paying that much for a 6990 is literally crazy.

___

I understand the retro tinkering myself as I often have way more fun playing with old parts and pushing them then my new stuff (mostly because if the old breaks it's not exactly a major loss) but that said, that 6990 even if you sold your current card and paid a total of $115 just isn't worth it. Honestly, sell the card you have now and pick up a 290 or preferably 290x..
Edited by SoloCamo - 6/12/16 at 7:08pm
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