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2 single 3870 GDDR4 or 3870x2 GDDR3?

post #1 of 12
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Hi all, i have a mobo that supports Crossfire and i am after one of those two combinations: 2 separate 3870s or 1 3870x2.
My questions are:

1) Will i have better benchmarkings and fps in games with the two separate 3870s (in Crossfire)?

What surprises me is that two separate cards with GDDR4 memory are cheaper than the 3870x2 with GDDR3. (I know there is one with GDDR4 coming out but pls narrow your answers on the ones i am asking about).

2) Will they be much better compared to my 8800GTS 512?

3) Do the single 3870s overclock well?
Thanks, Yannis
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post #2 of 12
Im getting a GB EX38-DQ6 and I'm thinking about selling my GTS and grabbing a 3870x2 and going TriFire.

And yes, the 3870s overclock like a dream. They are relatively near their volt limit though (from what I understand), so if you really want to do some overclocking, you need to get your hands dirty.
    
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post #3 of 12
I'm pretty sure the HD3870X2 scores higher in games than the HD3870 in crossfire.

RAM speed doesn't make much of a different on graphics cards. They have more than enough bandwidth as it is. The HD3870X2 preforms better with slower RAM because the latencies are lower for not only the RAM, but also by having the Crossfire bridge actually on the PCB and not having to go through the motherboard.
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post #4 of 12
1) moosfox is right.
read this article I found through GOOGLE

Note that if you can get the 2 3870's cheaper than the X2, and have the powersupply to run them, the review says that you might as well go for the 3870's. I would get an X2, stinge on Coke and frozen pizzas and get a 2nd X2 ASAP!

2) Whichever solution you go for, it should outperform the GTS, but not by much. I'd get a SLI-motherboard and a 2nd GTS, the SLI-/Nforce-lover that I am.

3) I have no experience with the 3870's, however I feel that OC'ing graphicscards on stock cooling has little to no effect, as you gain very little before problems arise.
post #5 of 12
I am running a pair of 3870's right now and they overclock and run like a dream. I am thinking about getting a x2 and removing one of my single cards and crossfiring the x2 and a single 3870.
I have been able to hit a 3Dmark06 score of 14498, and as far as AMD rigs go its the highest score on the site (for now) over all the 8800's.

http://www.overclock.net/amd-general...ark06-top.html
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post #6 of 12
1 card FTW, cooler, 1 slot and less power and less heat than 2 cards. 2 hd3870's are cheaper with the price drop but meh :/ they try to glamorize the flagship cards.
post #7 of 12
Personally, I would go with 2 cards because it's a much better value and it's more versatile if you ever want to drop back to one card for whatever reason and share the other one
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post #8 of 12
Not sure about the heat issue. I have both cards water cooled and there is no heat inside my case.

I would love to setup a water loop with a 3870 x2 and a single 3870. Or even better a pair of x2's...
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post #9 of 12
From what i have seen, two 3870's outperform a 3870X2.

But if it was me, i would probably get the X2, that way later on you could always buy another one if you wanted to.
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post #10 of 12
Quote:
Originally Posted by yannis7777 View Post
Hi all, i have a mobo that supports Crossfire and i am after one of those two combinations: 2 separate 3870s or 1 3870x2.
My questions are:

1) Will i have better benchmarkings and fps in games with the two separate 3870s (in Crossfire)?

What surprises me is that two separate cards with GDDR4 memory are cheaper than the 3870x2 with GDDR3. (I know there is one with GDDR4 coming out but pls narrow your answers on the ones i am asking about).

2) Will they be much better compared to my 8800GTS 512?

3) Do the single 3870s overclock well?
Thanks, Yannis
I forgot to answer your questions
  1. Yes, 2 in CF seems to scale slightly better than 1 X2
  2. Yes
  3. Oh yeah they do..... mine are way overclocked and can run up to 999/1350
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