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7950 Crossfire vs 680 SLI at 5760*1080 (Eyefinity/Surround)

MOOGLEYS said:
I cannot match most of them results with my pair of 7950's running @ 1250/1700 and cpu @ 4.8ghz. @ 5760x1080p my results are coming in a fair chunk lower. :(

I'm going to blame windows 8 and my board being 8x8..... :confused:
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Maybe - no idea what performance is like with crossfire, triple screen and Windows 8. I shudder just thinking about all the niggles which will come out with those combinations.

PCI-E 2.0 8x/8x should be fine (or only 1% slower) and you shouldn't be bottlenecked by the CPU on a benchmark at any stage.

Weren't you a good 100 points under me in Heaven as well with those clocks when I ran at 1150/1700?

On a separate note - now idling at 24c. This is the life :D :D.
 
I recorded with FRAPS rather than using the in game FPS readout?

Oh DOF was off as well because I couldn't get it to work with my 680's so turned it off on 7950's as well for a like for like comparison. You also are 100 MHz slower on the core, and 400 MHz slower on the memory effective speed. It's impossible to compare with these variances.

Your readings do seen very low for no AA which is the the killer at that resolution.
 
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Stanners said:
Do you have to turn tesalation on in the control panel with amd drivers?
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Rusty0611 said:
heavenc.png


That was with dual 1150/1700 clocks.
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No. Can see it's the same IQ as nVidia default here.
 
JAKUS said:
Nice work Rusty, I can totally appreciate how much time these things take and would like to thank you for the effort.

Now you are down to 1 7950 how about a comparison with a single 680 ?
I think it would be even more interesting to many people around here ;)
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Nope sorry. It takes too long to do it to a standard I'm happy with and "the beast" is boxed up and ready to be sold :).
 
Same.

For those interested - the sell up of the cards is now complete and had I kept both 7950's and sold one set of game codes and both Sleeping Dogs code I would have made £180 on the sell up. :eek:

For much faster performance. It's mind boggling.

I have to describe a strange phenomenon - one monitor syndrome. At first it was OK. It was good to be able to put my main monitor where I wanted as opposed to in a place where they all fit on the desk... but now everything feels small and my desk seems humongous. I never knew how I coped with only one before :( :(

(half joking)
 
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Crezzlin said:
OK.I changed my 680's for 7970's again, what I found was BF3 runs with a better fps on high settings and smooth but on ultra it bottles it big time, reason been when I use the 680's on ultra the fps are around 25/35fps but super smooth but it uses 3250mb of vram were as on high settings it only uses 2450mb.. this is at 7680x1440p.. I would love to try some 6gb 7970's but they are too much. :)
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Why? The extra VRAM only helps when you're running out of it. I'd be surprised if you used more than 3GB on a 3GB card.

The reading of > 3GB on a 4GB card doesn't mean anything due to caching when excess VRAM is available.
 
MyBrains said:
I wasnt talking about 3 monitors.. nevermind. Just trying to help u out with screen space :rolleyes:
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I never asked for help - I've got about 4 monitors in the garage if I wanted to run extended desktop with a second monitor again :D.

I was more describing the sensation of having MASSIVE screen space to having 'normal' screen space but perhaps you missed the point of that post. It's all good :).
 
As this kind of turned into a build log and people waiting for a "big but" for 5 pages before I got my results out I will post here:

I think I've decided to get a second 7950 but run one monitor still. Gone for HIS IceQ to help with CF temps.

Overkill? Definitely but I don't care it's my money :D. Also I can run them around 1100/1150 and take temps out the equation instead of 1200/1250.
 
I installed my second 7950 today and was greeted by temps of 61c while running the same overclock as the MSI Twin Frozr which was running around 75c.

So the "good" MSI is going back as well. An obvious dodgy batch of cooling on these MSI ones.

Now on my IceQ HIS card I think I might have dodgy VRAM! When will it end?!

The MSI thing can be written off as just one of those things but I might genuinely have a failed card now which after the fiasco of the heat on those MSI cards would be irritating timing.

I shall be claiming the postage back on the MSI cards for obvious reasons.
 
psychodil said:
I thought one of your MSI cards had good temps?:confused:

Always worth reapplying TIM with MSI cards, they don't mind you removing the cooler.

What's the matter with the vram?
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I thought it was good until I got the IceQ in..... It wasn't good at all. It was 15c worse :eek: which means the other one which is going back is 35c worse :D.

Now taking at face value the claims on the box.... MSI is 17c cooler than reference and HIS 12c cooler than reference that means that one card is 20c off where it should be and the other is 40c off where it should be.

Well the screen so far twice has bugged out gone blue once and brown/yellow stripes the other. It's possible the VRAM isn't as good quality as the MSI and can't take the high clocks. I've downclocked the memory to 1550 and it's OK so far.

MOOGLEYS said:
Your not having much luck. Maybe you should have stayed with Nvidia.. :D

Both my XFX cards idle between 30-35.c
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Ha! I was going to joke that but thought humbug might fly off the handle and derail my thread :D.

On a half serious note I am having serious regrets on selling the beast. Kind of wish I kept him. I didn't need the money for the sell up and if I was going again I would have kept it. Not due to problems - I'm pragmatic about these things - but just for ease of not having to swap and mess around.
 
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TheRealDeal said:
Pretty sure in the ocuk benchmark thread it was the surround people with the issues about switching back and forward from single screen to triple screen where as eyefinity users were not. I think if you get how to use each vendor correctly then i see little problem either way. I only use my tv and monitor which does not require eyefinity but its as easy as clicking replace and i am all good.
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You missed the part where I said "overall". As it looks like you've used neither you're not qualified to give an opinion :p.
 
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