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6870 Crossfire Questions

post #1 of 13
Thread Starter 
These are some pretty basic crossfire questions here, and I appreciate the help.

1. Can it be crossfired with a 6850?

2. I have a 2GB XFX 6870, if I crossfire it with a 2GB 6850 (if such a thing exists), will 2GB of VRAM be use-able? Would that be more powerful than a 1GB 6870 crossfired with my 2GB 6870?

3. Is the Antec HCG 620w enough to handle crossfire 6870's? I believe I heard it is... Phaedrus said it should be, and so did his PSU calculator.

4. Brands don't matter, correct? I can Xfire an XFX card with a sapphire card?
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post #2 of 13
Hey man

Not sure about xfire the 6870 wtih the 6850 however yes, that PSU is more than enough. Those cards can run on the power on an ants fart.

According to this

http://www.tomshardware.co.uk/forum/337321-15-xfire-hd6850-6870-help

It will work
post #3 of 13
Thread Starter 
Thanks a lot man, +1

Glad to hear my PSU is more than enough! Was worried it would barely be able to support two cards and cause problems or something.

So how would I go about setting up cards in crossfire?

Power everything off, shut off PSU (unplug it from the wall as well?), seat the new card in my second GPU slot, connect the crossfire bridge, plug back in, turn on PSU, wait for green light on mobo, turn on the PC, and install any new software or anything?
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post #4 of 13
Those cards don't use much power.

Even if one of your cards are 2GB, if the other is 1GB then total usable VRAM is 1GB.

You can crossfire a 6850 with a 6870 I believe. I would however recommend using 2 6870s for better scaling and FPS. Also make sure your motherboard's PCIe lanes run at 8x/8x or better in a crossfire setup. Although I think that 16x/4x isn't TOO bad.

In conclusion:
- You'll still have 1GB VRAM if one of the cards have 1GB
- 6850 with 6870 is possible but wouldn’t be as as smooth as 2 identical cards.
- Your PSU can handle it
- 8x/8x is nice but not essential.
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post #5 of 13
Thread Starter 
Yeah I believe my motherboard is 16x/4x, I couldn't fit/find an 8x/8x in my budget. Still, crossfire should be a huge leap over this single card, right?
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post #6 of 13
Quote:
Originally Posted by rivaldog View Post

Yeah I believe my motherboard is 16x/4x, I couldn't fit/find an 8x/8x in my budget. Still, crossfire should be a huge leap over this single card, right?

Should be, yes.

Is that OC in your sig stable 24/7? Nice NB clock. That will definitely help when running crossfire to lessen a bottleneck.

I will say now that the performance of 2 6850s or 2 6870s is comparable to the performance of a single GTX 580 in games where VRAM isn't an issue. However, microstutter is more prevalent in the 6800s when in crossfire. You might not have problems though.

In my opinion your best bet is to sell your current GPU and buy a 7850 or 7950 if you can afford one.
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by Edge Of Pain View Post

Should be, yes.
Is that OC in your sig stable 24/7? Nice NB clock. That will definitely help when running crossfire to lessen a bottleneck.
I will say now that the performance of 2 6850s or 2 6870s is comparable to the performance of a single GTX 580 in games where VRAM isn't an issue. However, microstutter is more prevalent in the 6800s when in crossfire. You might not have problems though.
In my opinion your best bet is to sell your current GPU and buy a 7850 or 7950 if you can afford one.

Yeah, it's stable except for two problems I was having. After about 7 or 8 months, I tried playing Assassin's Creed Revelations on my PC, and for some reason, the overclock did not like Assassin's Creed, and was causing it to crash at random occasionally, and then at certain points in the game. I couldn't get past certain parts of the game with out down clocking. After a little while the problem started occurring in Battlefield 3 as well, so I down clocked it and left it. It's at 3.65GHz right now, I think I left the NB the same. I'm thinking about restarting and overclocking to 3.7GHz, maybe 3.75GHz instead of all the way down to 3.65GHz. I wish I had a better cooler to get a higher clock, but I'd rather save money on a cooler to spend on a better CPU overall, or a new GPU tongue.gif

I would like to go crossfire with 6870's for the raw performance, but if you don't mind offering an explanation as to why you believe a single card of the next gen will be better, I'll surely consider that a visable option smile.gif

Also, would you be able to tell me how much my card will sell for?
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post #8 of 13
Quote:
Originally Posted by rivaldog View Post

Also, would you be able to tell me how much my card will sell for?

HD 6870 can be sold for 100 bucks. throw in another 200 bucks and get yourself a HD 7950. the sapphire HD 7950 is a good option

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202006
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post #9 of 13
Quote:
Originally Posted by rivaldog View Post

I would like to go crossfire with 6870's for the raw performance, but if you don't mind offering an explanation as to why you believe a single card of the next gen will be better, I'll surely consider that a visable option smile.gif
Also, would you be able to tell me how much my card will sell for?

When I sold my 6850s in the UK I got £65 each for them, so ~$104. I didn't sell them online, I sold them in person.

I believe it's better to go for single GPU next gen because in my experience, whenever a game took my crossfired 6850s down to 30 to 40 FPS (e.g. massive explosions on max settings on BF3), microstutter became noticeable, as did frame spikes because I had 1GB VRAM (as I said, even if another card is 2GB, total VRAM is equal to the least VRAM of 1 card).

That's why I believe a 2GB 7850 or 3GB 7950 is a better option. Don't bother getting a 7870 unless it's a good price - some are as expensive as cheap 7950s.
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

HD 6870 can be sold for 100 bucks. throw in another 200 bucks and get yourself a HD 7950. the sapphire HD 7950 is a good option
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202006

Quote:
Originally Posted by Edge Of Pain View Post

When I sold my 6850s in the UK I got £65 each for them, so ~$104. I didn't sell them online, I sold them in person.
I believe it's better to go for single GPU next gen because in my experience, whenever a game took my crossfired 6850s down to 30 to 40 FPS (e.g. massive explosions on max settings on BF3), microstutter became noticeable, as did frame spikes because I had 1GB VRAM (as I said, even if another card is 2GB, total VRAM is equal to the least VRAM of 1 card).
That's why I believe a 2GB 7850 or 3GB 7950 is a better option. Don't bother getting a 7870 unless it's a good price - some are as expensive as cheap 7950s.

If he sold 6850's for $104, I think I could snag a little more for my 6870, especially since it's the 2GB edition that's hardly being sold any where now. I'm thinking maybe I can get $120-$130 for it instead of just $100...

Edge of Pain, do you care to explain what microstutter is? Also, should I perhaps get a 7970 instead of a 7950? Is the performance difference worth the price difference between the 7950 and 7970?
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