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6850 cf x8/x8 or 6990? - Page 3

post #21 of 43
Exactly the same.
post #22 of 43
Quote:
Originally Posted by a pet rock View Post
Except that it'll be running at the 6850's clocks. I think the only reason to get the 6870 would be to replace the 6850 at some point down the road. Otherwise just save your money and get a second 6850. 6850+6870 just seems silly to me.

@OP, I think the 6870s is a better option. The 6870 has a better cooling, so that'll help in crossfire let alone the performance increase.
Wrong.
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post #23 of 43
there is a difference between 6850 xfire and 6870 xfire, but not enough for which you should sell your existing 6850 and get 2 6870's
no need to go through so much hassle
trust me, 6850 xfire should be enough, and even if you get a 6870 for great price, then no worries mate just match the clocks of both the 6850 and 6870 and you are good to go

and as for cooling, i cant say much cause i never owned the cards but its not like they'l boil your case
they are not gtx 590 after all
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post #24 of 43
Quote:
Originally Posted by damric View Post
Wrong.
What about my post is wrong? What proof do you have to back it up? Vague, cryptic single word responses are just not helpful. At the very least clarify for the OP's benefit, let alone what I want to learn in this field. If I really wanted to be rude, I could just link you to TOS and Professionalism Initiative, but that'd be about as helpful as your post. Please, enlighten me.
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post #25 of 43
Quote:
Originally Posted by a pet rock View Post
What about my post is wrong?
Quote:
Originally Posted by a pet rock View Post
Except that it'll be running at the 6850's clocks.
This part. That is no longer the case with AMD/ATI cards. The only thing that limits different AMD/ATI cards of the same tier in crossfire is amount of memory. Look it up yourself, or do your own experiments.

http://www.xbitlabs.com/articles/gra...cs_hd5750.html

http://www.xbitlabs.com/articles/gra...s-eah6990.html
Edited by damric - 5/31/11 at 5:16pm
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post #26 of 43
6990 has a very diminished return for the money. 2x 6850 is beast and will max pretty much most games for at least 1-2 year.
    
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post #27 of 43
VERY minimal performance impact @ 8x/8x. You wouldn't notice unless you were jesus.
post #28 of 43
Quote:
Originally Posted by damric View Post
This part. That is no longer the case with AMD/ATI cards. The only thing that limits different AMD/ATI cards of the same tier in crossfire is amount of memory. Look it up yourself, or do your own experiments.

http://www.xbitlabs.com/articles/gra...cs_hd5750.html

http://www.xbitlabs.com/articles/gra...s-eah6990.html
no offence but can you please quote it where it is written?
cant seem to find it
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post #29 of 43
Quote:
Originally Posted by damric View Post
This part. That is no longer the case with AMD/ATI cards. The only thing that limits different AMD/ATI cards of the same tier in crossfire is amount of memory. Look it up yourself, or do your own experiments.

http://www.xbitlabs.com/articles/gra...cs_hd5750.html

http://www.xbitlabs.com/articles/gra...s-eah6990.html
afik, all cards have to run at the same speed in crossfire or sli.
post #30 of 43
Quote:
Originally Posted by sid0972 View Post
no offence but can you please quote it where it is written?
cant seem to find it
Quote:
In "effect" in load terms yes but crossfire now, unlike in the past does not auto adjust clock speeds, if you take a 4870 and a 4850 as an example for how it used to be (if I remember rightly they were clock adjusted), both cards would run at the default 4850 (slower) speed, unless of course the user manually adjusted clocks so they were both the same (if that was possible).

Today, if you run a 5870 and a 5850, if they were reference the 5870 will run at 850, the 5850 will run at 725 (of course without manual adjustment), that, as you have pointed out may well lead to one GPU being more loaded than the other, simply because it is slower and therefore having to work harder and/or as you mentioned...... the SP difference? However the benefit now for enthusiasts is that they no longer feel that they are losing that overclock ability in their cards, they can run 2 different models at max overclocks (say 1050mhz for 5870 and 1000 for 5850) and see the performance benefits

Quote:
Originally Posted by wermad View Post
afik, all cards have to run at the same speed in crossfire or sli.
True for Nvidia SLI, no longer true for Crossfire.

Quote:
In an SLI configuration, cards can be of mixed manufacturers, card model names, BIOS revisions or clock speeds. However, they must be of the same GPU series (e.g. 8600, 8800) and GPU model name (e.g. GT, GTS, GTX).[20] There are rare exceptions for "mixed SLI" configurations on some cards that only have a matching core codename (e.g. G70, G73, G80, etc.), but this is otherwise not possible, and only happens when two matched cards differ only very slightly, an example being a differing amount of video memory, stream processors, or clockspeed. In this case, the slower/lesser card becomes dominant, and the other card matches. Another exception is the GTS 250, which can SLI with the 9800 GTX+, as the GTS 250 GPU is a rebadged 9800 GTX+ GPU.
In cases where two cards are not identical, the fastest card – or the card with more memory - will run at the speed of the slower card or disable its additional memory.
Quote:
CrossFire can be implemented with varying-GPU cards of the same generation (this is in contrast to Nvidia's SLI, which generally only works if all cards have the same GPU). This allows buyers who have varying budgets over time to purchase different cards and still get the benefits of increased performance. With the latest generation cards, they will only crossfire with other cards in their sub series. For example, GPU in the same series can be crossfired with each other. So a 5800 series GPU (e.g. a 5830) can run together with another 5800 series GPU (e.g. 5870). However GPU's not in the same hundred series cannot be crossfired successfully. (e.g. a 5770 cannot run with a 5870)

Edited by damric - 5/31/11 at 6:59pm
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