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Trifire 5850 worth $150?

post #1 of 10
Thread Starter 
My current rig is in my sig, i acquired the 2nd 5850 on a ncix sale a while back and have been enjoying it. However my friend who essentially has the same rig as me decided he is going to upgrade his GPU to a GTX 580 or HD 6970 and is giving away his 5850 for $100-150 (i can probably haggle it down to $100).

Now i have a few questions,

- A 1000w power supply should be able to handle all this correct?
- How much of a performance drop do i get if all 3 cards are not plugged into a PCI 16x Express?
- I've heard 5850's don't scale the best, but 3 way is still around 2.7x faster than a single card, is this correct?
- Will i need liquid cooling to keep them cool at stock speeds?
post #2 of 10
Thread Starter 
Sig doesn't work so heres my specs.

i7 920 - 4.0 Ghz HAF 932
Ati Radeon XFX 5850x2 Corsair HX1000w PSU
6GB 600 Mhz Dominator RAM
post #3 of 10
Quote:
Originally Posted by Snicklefritz View Post
My current rig is in my sig, i acquired the 2nd 5850 on a ncix sale a while back and have been enjoying it. However my friend who essentially has the same rig as me decided he is going to upgrade his GPU to a GTX 580 or HD 6970 and is giving away his 5850 for $100-150 (i can probably haggle it down to $100).

Now i have a few questions,

- A 1000w power supply should be able to handle all this correct?
- How much of a performance drop do i get if all 3 cards are not plugged into a PCI 16x Express?
- I've heard 5850's don't scale the best, but 3 way is still around 2.7x faster than a single card, is this correct?
- Will i need liquid cooling to keep them cool at stock speeds?
1000w is overkill
little to no drop
much more than a single card but any more than 3 is useless
no liquid is for OCing just have good ventaltion.
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post #4 of 10
please avoid double posting, use the edit button on the bottom right corner of your post.

To answer you question tri fire in most cases dont scale well so i would say dont do it. Even if you can get it cheap, the warranty on the cards is bout to be up so.

edited:
didn't glance at your question, a 1k psu will be plenty.
scaling ratio i dont remember but i know crossfire with two card is around 1.75 increase from 1 card. So i would say the 2.7x times improvement over one card is unlikely maybe a 2.4.

You wont need liquid cooling but a fan above the cards will help.

As long as the pci-e lanes at x8 then you should be good. At x4, your cutting it. A pci-e x8 runs a card at 92% compared to a x16.
Edited by lilraver018 - 3/3/11 at 8:15pm
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post #5 of 10
Quote:
Originally Posted by Smoblikat View Post
1000w is overkill
little to no drop
much more than a single card but any more than 3 is useless
no liquid is for OCing just have good ventaltion.
this, an 850w is enough for tri-fire. As long as it's a good quality unit.
    
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post #6 of 10
1kw is too much you just need around 850w(unless you are under extreme conditions causing you to require 1kw)..yes if you already have the card..IMO its still a beefy DX11 card...so its worth going tri-fire
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post #7 of 10
Thread Starter 
These forums rip by! And so helpful too. Sorry bout the double post and thanks for the info, I was going to stop upgrading my PC for a year or two and then build a new one from scratch possibly with the lian li armorsuit so i wasn't planning on getting a 6970 or 5970 but when my friend offered the discounted 5850 how could i refuse.

Now i just need to find out why i can't OC my current cards (stuck on stock Volts AND stock Core/memory of 765/1125 )
post #8 of 10
Power Supply is fine.
Unless your using 4xPCIE, there isn't a drop at all.
The performance scaling isn't 100% on 3 cards, but you should get 60% boost from 2 cards, or a 260% boost from 1 card. could be up to 300% boost depending on drivers.

Now, it's defiantly worth getting. If you have air flow issues, put a 120mm fan in between the top 2 cards, with some cable ties.
post #9 of 10
Nothing wrong with a 1000W. If you might do something crazy as quadfire later on or some heavy overclocking it's all worth it. 1000W isn't that much more expensive than a 850W.
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post #10 of 10
Thread Starter 
Kinda an offshoot of this thread but hey figure i might as well, i can overclock each 5850 individually, and both of them when x-fire is off, but as soon as xfire gets turned on and i try to overclock the 2nd card my system restarts or BSOD's even if its a really small amount. I've tried GPU tool and MSI afterburner, the CCC only goes up to 775/1125. Is there anything else i could try before i do a bios flash? Because that seems a bit TOO risky for me.
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