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6870's in crossfire - Page 2

post #11 of 22
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Should I wait for the 7000 series gpus?
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post #12 of 22
Quote:
Originally Posted by spinejam;15557596 
My personal experience -- I ran 2 msi 6870 TFII's in my sig 'puter and scored p8800 in 3dmark11. They scale well. smile.gif


Oh yeah! thumb.gif
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post #13 of 22
I am running dual 6870's. A single 6870 will run BF3 in High settings at 50-60FPS... my 2nd card should be back here in about 3 days, and supposedly will run ultra settings right aroudn the same.
post #14 of 22
Quote:
Originally Posted by tannersimms;15557497 
I was wondering if I should buy another 6870 or just buy a different card, what do 2 6870's compare to?

Well since your already into two AMD 6870's I'd stay put. No reason to tri-crossfire them right now.

I know for your 1080i monitor your doing just fine with current gaming.

New cards come out end-Dec / mid-Feb time frame. I'd just wait at this point and juncture.

Pricing will drop, especially on the low end cards once next gen comes out and you'll save more if you decide to get a third or even upgrade entirely. Don't close the door or knock yourself out of that choice by making a move in haste.

You can then re-access your choices/options at that time.

As for your question how do they compare?

The 6870's crossfire bench shown on previous page was a bit out dated as drivers on both sides have come out a few times since and personally with each driver update I've gained free performance boosts in FPS.

Between different games/settings varying to VRAM usage, they still edge over a single stock GTX 580 performance and a tiny bit more so over the stock 6970.

That's my 2cents.gif - Hang in there is the most practical advise.

Edited to add since I was still the last post Aug 2011 review of cards in SLI or Crossfire. Find your two AMD 6870 1GB cards and you can compare your performance across the board.

Source

08b_index_enthusiast.png

08a_index_gamer.png

Looks like three AMD 6870's 2GB Tri-fire is about equaling two AMD 6950's 2GB crossfire. Also at the top spectrum it takes four AMD 6870 2GB Quad-Fire cards to just top two GTX 580's SLI. smile.gif
     
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post #15 of 22
Quote:
Originally Posted by Arizonian;15563432 
Well since your already into two AMD 6870's I'd stay put. No reason to tri-crossfire them right now.

I know for your 1080i monitor your doing just fine with current gaming.

New cards come out end-Dec / mid-Feb time frame. I'd just wait at this point and juncture.

Pricing will drop, especially on the low end cards once next gen comes out and you'll save more if you decide to get a third or even upgrade entirely. Don't close the door or knock yourself out of that choice by making a move in haste.

You can then re-access your choices/options at that time.

As for your question how do they compare?

The 6870's crossfire bench shown on previous page was a bit out dated as drivers on both sides have come out a few times since and personally with each driver update I've gained free performance boosts in FPS.

Between different games/settings varying to VRAM usage, they still edge over a single stock GTX 580 performance and a tiny bit more so over the stock 6970.

That's my 2cents.gif - Hang in there is the most practical advise.

Edited to add since I was still the last post Aug 2011 review of cards in SLI or Crossfire. Find your two AMD 6870 1GB cards and you can compare your performance across the board.

Source

08b_index_enthusiast.png

08a_index_gamer.png

Looks like three AMD 6870's 2GB Tri-fire is about equaling two AMD 6950's 2GB crossfire. Also at the top spectrum it takes four AMD 6870 2GB Quad-Fire cards to just top two GTX 580's SLI. smile.gif

You understand it wrong, they are not 2Gb 6870's, they are talking about the 6870x2 which is a dual gpu card with 1GB per gpu, 6870's are limited to crossfire since they only have 1 cfx conector. To do tri-fire you need a 6870x2 card + a single 6870 and to do quad-fire you will need two 6870x2 cards.
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post #16 of 22
Quote:
Originally Posted by Ivan TSI;15557789 
1 6870 will NOT max games @ 1080p, at least not gpu demanding ones like metro, Crysis 2, BF3 etc.

I don't know but in my own experiance I run a single 6870 outputing to a 42" LCD TV and never had a problem running Crysis 2. That being said I am looking to upgrade to a second 6870 only to have a second monitor.
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post #17 of 22
Quote:
Originally Posted by Ivan TSI;15598932 
You understand it wrong, they are not 2Gb 6870's, they are talking about the 6870x2 which is a dual gpu card with 1GB per gpu, 6870's are limited to crossfire since they only have 1 cfx conector. To do tri-fire you need a 6870x2 card + a single 6870 and to do quad-fire you will need two 6870x2 cards.

I think you misssed it because the 6870x2 DUAL GPU card was about the 14th down on that list. wink.gif
     
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post #18 of 22
Please read carefully, you were talking about 4 HD6870 cards and in the chart states a 6870x2 dual gpu card + a 6870 for tri fire; and 2 6870x2 dual gpu cards for quad-fire. Theres no other way for doing tri or quad fire since all those cards (6870 and 6870x2 dual gpu) only have 1 cfx connector
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post #19 of 22
Since there was a thread about Crossfiring two 6870's, I didn't want to start a new one.

I bought a second Radeon 6870 over Christmas and hooked it up to my motherboard, connected the crossfirex cable, and ran it. Now, I had some suspicions that this wouldn't work because the fan on the top card sits right against the board of the bottom card. So the bottom card i fine, but the top card gets so hot due to no airflow that it shuts my computer down.

I've tried sticking a fan right next to them and even opening my case and using a huge fan to move air through there. I've gone as far as to pry the cards apart a few centimeters (which worked somewhat well, but makes me crazy incomfortable). But the top card still gets hot.

I don't like to be a noob, but I literally haven't seen posts anywhere about this issue. I'm looking into buying PCI-E extension cables as a last resort to separate the cards. I'm somewhat new to upgrading computers, and I'd like to learn.

Has anyone had this issue and/or what do you think is the best way of rectifying it so my card doesn't melt?

Thank you for your time!
post #20 of 22
Quote:
Originally Posted by Zellfreid View Post

Since there was a thread about Crossfiring two 6870's, I didn't want to start a new one.
I bought a second Radeon 6870 over Christmas and hooked it up to my motherboard, connected the crossfirex cable, and ran it. Now, I had some suspicions that this wouldn't work because the fan on the top card sits right against the board of the bottom card. So the bottom card i fine, but the top card gets so hot due to no airflow that it shuts my computer down.
I've tried sticking a fan right next to them and even opening my case and using a huge fan to move air through there. I've gone as far as to pry the cards apart a few centimeters (which worked somewhat well, but makes me crazy incomfortable). But the top card still gets hot.
I don't like to be a noob, but I literally haven't seen posts anywhere about this issue. I'm looking into buying PCI-E extension cables as a last resort to separate the cards. I'm somewhat new to upgrading computers, and I'd like to learn.
Has anyone had this issue and/or what do you think is the best way of rectifying it so my card doesn't melt?
Thank you for your time!

What software are you using for a manual fan profile? Sounds like you may not have one.

When two cards are sandwiched the top card being suffocated from fresh air tends to run about 10C hotter than bottom card temp on average.
     
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