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-   -   Need expert GPU/Eyefinity opinion (http://www.hardwarecanucks.com/forum/video-cards/46225-need-expert-gpu-eyefinity-opinion.html)

Rikan S-087 September 5, 2011 03:15 PM

Need expert GPU/Eyefinity opinion

I have a good job and thus have some money to spend on my rig. I run a triple display Eyefinity setup, currently powered by a Vapor-X 5870. While it performs admirably at a resolution of 5970*1080, it understandably cannot handle AA and other eye candy being a) just one card and b) 1 GB of VRam. I plan to upgrade my motherboard to the new Sabertooth Tuff series. I believe my AMD Phenom II Hexacore will more than suffice at stock settings.

So, here is what I understand when it comes to GPU's/Eyefinity:
1. The more VRAM, the better. Even upgrading to a 2gb card would help immensely when scaling at that resolution.

I have been researching benchmarks, and here is the cards I have my eyes on:

1. HD Radeon 6990 (4GB VRAM) $729.00
2. Crossfired 6970's 2gb card(s).

Now I understand that the crossfired 6970's outperform the 6990 in some benchmarks and price as the 6990 was down-clocked to accommodate two gpus on one card. HOWEVER, with a whopping 4 GBs of VRAM, would the 6990 not be the card of choice for the Eyefinity enthusiast looking to max out every game at enormous resolutions (5970*1080)??

Any help would be appreciated!

Arinoth September 5, 2011 03:32 PM

I'd gladly give you some of the insight I've incurred from my numerous different card set ups in spirit of multiple monitor gaming.

Here have been my following set ups
SLI 465 GEs (Unlocked to 470s)
Xfire 6870s
SLI 560 Tis
SLI 580 3GB (waste of money really for the extra vRam)

Currently sporting Xfire 6970s.

Now onto your own question, I'd highly recommend going with the xfire 6970s over the 6990 unless you do not have a motherboard which can support x16 for both cards. The thing about that 4GB of vRam is the fact its still separated for the two graphical processing units on board. This means each is still only getting the 2GB that a regular 6970 would get. The only advantages you get from a 6990 over a 6970 is the fact that it uses up one pci-e 2.0 slot rather then 2, and consumes slightly less power then 2 6970s. Anything else, xfire 6970s school the 6990.

Will you be able to max out everything at that resolution with 2 6970s or a 6990, you will be able to get close, however there are some games and some features that are still too much for current generation dual cards to handle. Such examples are Crysis 2 with the DX11 and high res patch on ultra settings (frames can dip down to 20-25) as well as The Witcher 2 with uber sampling (brings most gpu set ups to their knees with no noticable improvement in what you see on the screen).

Hope this helps.

Rikan S-087 September 5, 2011 03:48 PM

What about tri-fire 6970's? Thanks for the information so far. I could have running 3 6970's (*16,16,8 lanes) Mobo is Asus Sabertooth tuff series.

roh_ultima September 5, 2011 08:16 PM

heres a nice review on that
XFX HD6970 3-way CFx & HD6950 CFx review | KitGuru

they have 2x and 3x in there. notice the minimum FPS
the difference there is very small between 2 or 3 cards

also for temps, 3x is a bit higher then just 2 cards

review with eyinfinity being used
XFX Radeon 6970 and Radeon 6950 Graphics Card Review - 3-Way CrossFire / Eyefinity vs SLI

Arinoth September 6, 2011 04:32 AM

IF you were to go tri you'd see slightly better performance though probably not worth the extra amount of money of the card. Also, unless you have a 1kW power supply or higher you'd need to upgrade to something like that as well for tri. For xfire i'd recommend 750W if everything is going to be run at stock, 850W if you're doing some overclocking.

Rikan S-087 September 6, 2011 06:17 AM

Thanks guys! I run everything at stock. I have an OCZ fatality 750W psu--that should power two 6970's at stock speeds. So, to your knowledge: there is no way yet to max every game in eyefinity?

Arinoth September 6, 2011 06:24 AM

Well you can run them max, what you may end up is with lower frames. Remember the fact that 3 monitor gaming is relatively new and with the hardware technology with graphics cards they just aren't there yet to give a guaranteed 60 fps across a 6000 x 1080 resolution with 2011 games.

roh_ultima September 6, 2011 07:53 AM

well you can see how the games perform with 3 way and 2 way crossfire

the way i see it, minimum fps determines your game play more than max fps
since 2x and 3x crossfire almost has the same min fps...there really is no gain of going to 3 cards

i know the average will probably be higher

but considering your PSU, i would only go with two 6970's for now

also, AMD's newer video cards are supposed to be coming out soonish
but that could be this month to as late as end of the year :/

Rikan S-087 September 6, 2011 08:01 AM

True. So IYHO, you believe a CFX*2 6970s will do the trick?

roh_ultima September 6, 2011 08:05 AM

well i'm not sure if these are 100% accurate. but.. i'll post it anyways

AMD's Next Generation 28nm HD7000 Series (Southern Islands) Graphics card Specs Leaked

the new mid range will be a little more powerful than a 6950/6970. the top end will have a lot more TMU's and ROP <- double the ROP's

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