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To do or Not to do CF

post #1 of 43
Thread Starter 
Hello;

I have a single sapphire 7870 ghz edition 2 gb gfx card. I want to buy another one and cf them. The problem is, will there be annoying micro-stutter at games like crysis 3 or tomb raider? if there is what gfx card can you recommend to reach the same level of performance with single gpu?

I watched a video with cf ms problem here: http://www.youtube.com/watch?v=gzE6DWzrg9s

can this problem happen with 7870s?

Here is my rig:

Amd fx 6300 4.4 ghz
8 gb ram
Asus m5a99x evo r2
128 gb ssd
Ocz fatality 750w psu

Thks
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post #2 of 43
You most likely will encounter micro stuttering, In my opinion you could sell your 7870 and go for a 7970
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post #3 of 43
Thread Starter 
1 question i checked alienwares site they are using 2 7870s in cf mode in most of his desktop products. If there is an issue like big ms how can they choose to do so? Are they optimizing their products against ms or 7870s cf is ok?
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post #4 of 43
have not played tomb but c3 with my hybrid crossfire (7950/7970) was smooth. first time to try crossfire and played bf3 as soon as the second card got installed. smooth as butter. also, those 7870s are pretty fast and should be supported by an equally fast cpu. i have no experience with the 6300 but the 8300s are no doubt the best amd cpu.
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post #5 of 43
Quote:
Originally Posted by wthenshaw View Post

You most likely will encounter micro stuttering, In my opinion you could sell your 7870 and go for a 7970
I would do this. Sell the 7870 and with the extra you had put away for the other card just grab a 7970 smile.gif
post #6 of 43
Stick with single cards. I have been ranting about this today on this board it seems! I'll copy in what I said to someone else just a moment ago.
Quote:
I'm going to totally avoid Xfire from now on. I've had it in the past and it was a disappointment (I had Xfire X1800s and X1900XTXs! ) and it's still a disappointment now.

In terms of explaining microstutters, it's like you're losing frames every now and then, and the net effect of it is that the frame rate looks a lot lower. When I had dual 6850s, I was getting brilliant frame rates (100+), but switching to a single card would make it looks like I was getting more, even though programs were reporting less.

This is due to the way that FRAPS etc work, they count every frame rendered, if its a nice whole screen frame, or even if it's just a tiny, dwarfed sliver of a frame. This means that you can get tiny slivers of frames, fraps will count them, and will score you a great FPS, but your eyes will still be waiting twice as long for another frame. Microstuttering apprears when you have a cluster of this effect happening on your screen at once, and your eyes are waiting for lots and lots of frames that aren't being rendered properly to stack up into a whole image.

Coupled with that, the effect is worse when you have newer games that AMD have to fudge the drivers to make work properly with Xfire. newer games come out, and you get negative performance by using crossfire as opposed to without, and that's according to frame counting programs (fraps). Imagine how bad the actual image quality in this case is!

Hope this helps... Google "Frame rating" if you want to know more, there are videos that show you the issue. I personally have been aware of it for a long time, but it seems that data is coming out now to make it more apparent.
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post #7 of 43
Thread Starter 
thks for the replays. Cf seems problematic but i wonder why brands like Alienware sells products with cfs?
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post #8 of 43
Quote:
Originally Posted by Hicuty12 View Post

thks for the replays. Cf seems problematic but i wonder why brands like Alienware sells products with cfs?
Because people will look at benchmarks and see super high FPS values and buy the Alienware PC based on that redface.gif

I would agree with most other people and say to avoid CrossFireX if you can. I had a single 460 which was feeling its age, and decided to try SLI, but as Double Helix explained well, gaming doesn't feel as smooth despite the FPS values being super high.

One example for me was Skyrim. I put it on ultra and knocked the shadows back to high, then enabled Vsync. With one 460, inside, it was totally smooth at 60FPS. With two 460s, I was still getting 60FPS but it didn't feel smooth because of micro-stuttering.

One issue for me was that my cards only had 1GB of VRAM and that held them back as well. Whilst you do have 2GB of VRAM, moving to a 7970 would give you the 3GB whereas two 7870s would be stuck with 2GB.
post #9 of 43
Crossfire works fine for most people including myself. One of the reasons it has such a bad reputation is because all we hear about is it not working. We see a ton of posts every other day saying, "Help! Crossfire not working right. Microstutter!" We don't see any posts that say, "Hey! Crossfire is working perfectly!! Just came here to brag!." For the majority of people that crossfire is working for, we don't see them at all. What reason do they have to come on here when they don't need help? The only time we hear about it is when something goes wrong. That being said the only game I have a problem with is Far Cry 3 and there is a very simple solution for it. Go into CCC and uncheck crossfire and play it with a single card. Every other game runs perfectly. Crysis 3, Bioshock Infinite, Metro 2033, BF3, etc. Nvidia has the same issues with their drivers. They both do.
post #10 of 43
Look at my rigs. I have no problems with microstutter, and my brothers who are much more aware, don't see any microstutter in my rigs. I have had no problems with ms whatsoever. I would say go Xfire. This is coming from my own personal experience, as RavageTheEarth has also said. Maybe all three pairs of our eyes are just not as sensitive as others rolleyes.gif
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