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HD6870 CFX power requirements

post #1 of 15
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I'm looking at getting 2 HD6870 to CF

but I've heard all sorts of horror stories about micro stutter and having to set up CFX profiles for certain Games, is this a reality or just the few who have problems speaking up?

should I go CF or should I go with something like an HD7850 (I really cant afford anything more)

also if I go with the CF will my PSU handle it? (this is for my sig rig) I'm OCed to 4.4ghz @ 1.33volts and all powered by PC power and Cooling 750w PSU that I've had for about 3 years.
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post #2 of 15
Your PSU will handle it if you go crossfire no prob.

Personally, I'm over crossfire/sli as most of the time you wait till a new game gets crossfire/sli support, some games engines don't support crossfire/sli or AMD/NVIDIA may not either, some games may even play poorly in crossfire/sli and you have to disable that feature to up your FPS and yes there is stuttering, although rare (I've only experience it with Crysis Warhead), there more heat and noise in case, more wattage used and it goes on.

I'd stick with your 7870 idea.
 
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post #3 of 15
if you have a 6870 I would say wait for the 8xxx series. You will notice some improvements if you go CFX but like mentioned, a lot of games don't come out with the greatest of SLI / CFX support. So, unless you are playing a game for a while (long enough for issues to be ironed out) in a lot of cases it simply isn't worth it.

If you are at 1080p the 6870 is a decent enough card, and nothing out there is "unplayable", you might not get all the eye candy, but save the $$ you would spend on another 6870 (or 7850) and wait til 8xxx. Who knows, you might be able to pick up a 7950 in the market place for around $200 when the 8xxx series launches.
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post #4 of 15
I have used 2x 6870 for the past year. Right now I am beginning to see performance problems due to lack of VRAM on the 6870. You'd be better getting a 7000 series with at least 2GB VRAM, or more.
post #5 of 15
Thread Starter 
Quote:
Originally Posted by Gunderman456 View Post

I'd stick with your 7870 idea.

well if I could I'd get that...sadly I'm looking at 7850 which are anywhere from $60-$120 cheaper than the 7870

btw what is with the wide range in pricing on these cards? I'm come across 7850 like this:http://www.newegg.com/Product/Product.aspx?Item=N82E16814150617

that are less than $170 after shipping

but then there are these: http://www.newegg.com/Product/Product.aspx?Item=N82E16814161424
around $210 after shipping thats $40 more

also what kind of FPS can I expect if I were to run eyefinity 1920 x 3240 (1080 portrait) in things like BFBC2, Crysis, and TF2?

Edit: Never mind I went and looked again and realized that one is a 2gb version and one is a 1gb version
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post #6 of 15
For gaming the 7850 will struggle at that resolution, you may get away at low settings to mid depending on the game.
 
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post #7 of 15
Don't go for HD 6870 CF. sell your existing card. spend the extra money and get a HD 7950. For 270 bucks after mail in rebate its such a good deal right now with the NEVER SETTLE game bundle. With 12.11 beta driver the HD 7950 (1.1 Ghz) will be clearly faster than HD 6870 CF.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202006

Waiting for the HD 8000 series is not a good idea. the HD 8870 is expected to match GTX 680 performance for 280 bucks. But the HD 7950 already gives you better performance than GTX 680.

here is a user who switched from GTX 680 to HD 7950. With 12.11 beta HD 7950 is faster than GTX 680 when both are OC'd
http://www.overclock.net/t/1318674/tpu-amd-announces-never-settle-catalyst-12-11-driver-update/150#post_18428759
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by Gunderman456 View Post

For gaming the 7850 will struggle at that resolution, you may get away at low settings to mid depending on the game.

so would the 7870 be able to handle that?

or what about the CFX 6870? would that work better for Eyefinity than 7850?
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post #9 of 15
Quote:
Originally Posted by Jim888 View Post

so would the 7870 be able to handle that? or what about the CFX 6870? would that work better for Eyefinity than 7850?

whoa wait a minute. Eyefinity. just don't even bring HD 7850 , HD 7870 or HD 6870 CF in the discussion. The only cards worth picking are HD 7950 and HD 7970.
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post #10 of 15
the power requirement of one 6870 is about equal to one 7950. the 7950 is about twice as powerful. sell your 6870 while you can still can get a good deal and get a 7870 or 7950. i've seen some 7970 selling for the same price as the 7950.
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CPUMotherboardGraphicsRAM
2700 4.5/ 1.28 77 290 (2) 16 / 1866 
Hard DriveCoolingOSMonitor
1000 360/240 10 64 28 2160 
PowerCase
850 540 
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