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Trifire 7950's

Chrisoldinho

Chrisoldinho

Chrisoldinho

Associate
Joined
17 Apr 2010
Posts
461
Hi,

Currently I own a pair of HIS IceQ Turbo 7950's, that I am using primarily for Litecoin mining.

I am looking to add a third card into the mix. Unfortunately due to the size of the HIS coolers, they effectively only allow me to fit 2 into my Sabertooth 990FX board.

As such, I plan on selling the at least 1 of the HIS cards, and purchasing 2 cards that would fit (I may even just sell both HIS cards and purchase 3 so it looks nice :D)

Whilst mining is now the PC's primary use, I do like to have an evening gaming session now and again and I run 6048x1080 so Trifire will not be without it's uses at times.

What 7950's should I buy, the case has decent cooling, but as this rig will be on 24/7 I am concious that a reference cooler might not be up to the job. I would prefer a reference board if possible however :)

Also, what PSU would be sufficient to drive 3? Currently I own an Antec 750W PSU, this is fine for my CF setup on an over clocked 8350 but I am not sure it could handle 3 cards.

Thanks,
Chris
 
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well for 3x7950 you need a 2 slots versions, I can tell you that the reference cooler does a good job up to 1000mhz, 2 slots aftermaket coolers are good, but usually the top card gets really hot because all the heat goes to it.

a 850W PSU would take care of 3x7950 without overclock a 1000W psu would hold 3x7950 with a moderate overclock.
 
Mr. May said:
http://www.overclockers.co.uk/showproduct.php?prodid=GX-065-HS&groupid=701&catid=56&subcat=1673

Are these the cards you have got?

I would get this psu...

http://www.overclockers.co.uk/showproduct.php?prodid=CA-009-XF&groupid=701&catid=123&subcat=2464
Click to expand...

Yes I have that card at present, but I cannot fit a 3rd. It's only a dual slot cooler at one of the card, it becomes more of a 3 slot cooler at the other end, thanks for the PSU link.

Drangueos said:
well for 3x7950 you need a 2 slots versions, I can tell you that the reference cooler does a good job up to 1000mhz, 2 slots aftermaket coolers are good, but usually the top card gets really hot because all the heat goes to it.

a 850W PSU would take care of 3x7950 without overclock a 1000W psu would hold 3x7950 with a moderate overclock.
Click to expand...

Thank you, I have been looking at the XFX DD 7950's, sadly OCuK don't sell them, but they are dual slot, have an after market cooler and look pretty neat.
 
I have an XFX DD, its voltage locked so i wouldnt bother if ya gonna overclock, coolers are really loud also.
 
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3 x MSI HD 7950 Twin Frozr III Boost Edition 3072MB GDDR5 PCI-Express Graphics Card **NEW REVISION** with Crysis 3, Farcry3, Shogun2, Dirt Showdown & Bioshock PC Games £233.99 (£701.97)
Total : £701.96 (includes shipping : FREE).



Voltage adjustment is available on the TFIII, but the coolers are noisier than the voltage locked WF if noise is an issue-not knowing what kind of load bit mining pulls out of a card:

YOUR BASKET
3 x Gigabyte ATi Radeon HD 7950 Windforce 3X 3072MB GDDR5 PCI-Express Graphics Card with Crysis 3 & Bioshock PC Games £251.99 (£755.97)
Total : £755.96 (includes shipping : FREE).



Both are true 2 slot coolers though.

Just in case you never thought of it, there is the option of purchasing just one of the above and sandwiching it in between your other gpus negating the need for 3 new cards as well, on the presumption your board already has space for a 3 slot cooler in the top slot.:)
 
if your LTC mining and have a spare PCIE 1x slot then please just get a 1x - 16x riser and you can just add another card! litecoin mining doesnt care about bandwidth so you can use any PCI-E slot to plug in as many cards as your PSU / mobo can take.
 
Chrisoldinho said:
Thanks I didn't think about this :)

It would make more sense. How do different brands react together?

Chris.
Click to expand...

Best case scenario, they all work fine in AB, voltage adjustment in both core/vram(my Ice-Q boosts are now fully supported).

Worst case scenario, you have to use two oc tools, eg His iTool for both Ice-Q's and AB for the FIII/WF, but as above, AB support should be good for the 3 of them now-if you go for the TFIII, as, idk for sure how AB support is with Ice-Q's in conjunction with the WF.:)
 
supergt said:
if your LTC mining and have a spare PCIE 1x slot then please just get a 1x - 16x riser and you can just add another card! litecoin mining doesnt care about bandwidth so you can use any PCI-E slot to plug in as many cards as your PSU / mobo can take.
Click to expand...

I thought about this, but will do ad hoc gaming so don't mind spending a little extra.

tommybhoy said:
Best case scenario, they all work fine in AB, voltage adjustment in both core/vram(my Ice-Q boosts are now fully supported).

Worst case scenario, you have to use two oc tools, eg His iTool for both Ice-Q's and AB for the FIII/WF, but as above, AB support should be good for the 3 of them now-if you go for the TFIII, as, idk for sure how AB support is with Ice-Q's in conjunction with the WF.:)
Click to expand...

Great, I think I have now made my mind up on the TFIII's. Are the new revisions hardware changes, or just a new BIOS?
 
Fair play, also incase you didnt know for mining the cards can all be different and crossfire decreases kh/s ! But yeh for gaming I guess it doesnt apply!
 
I had 3 670 WF cards and found an issue with the fans catching on the back of the card below it when the fans sped up. Maybe this was just me though, but I wouldn't get 3 WF cards again (I'd get WF cards again, just not 3 of them).
 
I was going to pull the trigger, then thought against about just getting a riser cable, I have enough space below the motherboard (CM Stormtrooper case).

Anyone have any experience of riser cables for PCI-E x16 and if it affects performance in anyway or introduces latency?

Chris.
 
If your doing tri-fire I'd make sure as many of those are reference style cooling as possible! 3 GPU's dumping heat into the case can cause a lot of problems.
 
Bacon? said:
If your doing tri-fire I'd make sure as many of those are reference style cooling as possible! 3 GPU's dumping heat into the case can cause a lot of problems.
Click to expand...

see above i have 2 blower 7950's currently, trying to add a third his ice q ideally but not sure if a rise cable like this That website is unfortunately a competitor. (ocuk don't sell them so shouldn't be infringing anything here).

I just want to check that it would be ok and wouldn't introduce latency.

5cm would be enough, never mind 11-15cm like the ones I have seen :)
 
20 quid? woah seems a bit expensive for that!

what is the tri-fire for primarily? mining or gaming or both? dont think you should see any difference with it. However you should maybe look at getting a riser with a molex cable just incase
 
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