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Old 12-09-2007, 12:16 PM   #11 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

Quote:
Originally Posted by Peter.Cort View Post
i don't believe they clock to the lower card speed. i think what they do is they have this thing that is like alternating frame rendering or something to that effect so it utilizes the more powerful card to its full extent and still is using the xfire.
Wouldn't that cause severe frame rate fluctuations with 2 cards?


ANYWAYS...

I can't wait. These look like the 8800gt killers. Should I go 3850, or 3870?

Gotta get rid of my power hungry x1900xtx
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Old 12-09-2007, 12:52 PM   #12 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

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Originally Posted by Peter.Cort View Post
i don't believe they clock to the lower card speed. i think what they do is they have this thing that is like alternating frame rendering or something to that effect so it utilizes the more powerful card to its full extent and still is using the xfire.
No, they will downclock...also if 1 card has 256mb while the other has 512mb the card with greater memory will disable 1/2 of it to match the 2nd card.

Crossfire has always worked this way.
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Old 12-09-2007, 01:40 PM   #13 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

im crossing 2 3870's on the 20th this month. the 880ogts is the way to go between 2 3850's an the gts, definatly go gts. my 2 3870's are gona wreck everything cant wait to start oblivion again.
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Old 12-09-2007, 01:56 PM   #14 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

Crossfire 3870's will be nice but im curious to see how well 8800GT's SLI against them...i still think the HD3870 is a better deal though.
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Old 12-09-2007, 06:07 PM   #15 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

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Originally Posted by Sora View Post
Crossfire 3870's will be nice but im curious to see how well 8800GT's SLI against them...i still think the HD3870 is a better deal though.
Xfire normally does better than SLi, right?
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Old 12-09-2007, 06:12 PM   #16 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

SLi>Crossfire
8800GTS>3850

But, if you want some really good performance, go with 2xHIS3870 in Crossfire.
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Old 12-09-2007, 07:43 PM   #17 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

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Originally Posted by gurusan View Post
Also 1 thing to note is that performance will be a bit higher on x38 motherboards as the P35 only has the 2nd PCI-E slot running @ 4x, which significantly impacts performance. I did a test of my own and scored about 15% less in 3dmark06 using a x1900GT (tested at both x4 and x16)
yes, the 38X0 cards really need to have 8X PCI-E bandwith or more.
Quote:
Originally Posted by Vaanish View Post
I am wondering about this... does this give the performance of a 3850 and a 3870, or do both the cards get brought down to the lowest card? (i.e. 2 3850s)
The 3850 will bottleneck the 3870, except maybe if it uses alternate frame rendering.
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Originally Posted by gurusan View Post
Yeah I wouldn't recommend crossfiring a 3870 and 3850 because the 3870 will just downclock to 3850 speeds...which means it's a complete waste of money and you would have been better off just buying another 3850
underclock isn't the right word. The 3870 will run at its default (or overclocked) clock speeds. It will be slowed down by the 3850 though.

If you go crossfire, even though it's possible to use two different types of card, it's best to use the same type.
Quote:
Originally Posted by psp_crazy1
Xfire normally does better than SLi, right?
Yes. Crossfire scales better than SLI does.

A single 3850/3870 won't be as fast as a single 8800 GT, but crossfired 3870's will be faster on average than SLI'd 8800 GT's.
I'm not sure how crossfired 3870's will perform against SLI'd 8800 GTS's (G92). The G92 GTS's will probably be a bit faster, but the 3870's are cheaper.

Quote:
SLi>Crossfire
8800GTS>3850
Actually, it's:
Crossfire > SLI

3850 < 8800 GTS (G80) < 3870 < 8800 GT < 8800 GTS (G92) in single card configurations

8800 GTS (G80) < 3850 < 8800 GT < 3870 < 8800 GTS (G92) in SLI/Crossfire

Personally, I'm going to crossfire 3870's.
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Old 12-09-2007, 07:48 PM   #18 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

Good post Apok, but I would say

8800GT ≤ HD3870 In SLi/CF
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Old 12-09-2007, 07:55 PM   #19 (permalink)
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Default Re: Crossfire 3850's Vs. 8800GTS G92

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Originally Posted by Vaanish View Post
Good post Apok, but I would say

8800GT ≤ HD3870 In SLi/CF
which is what's in my post

on average, crossfired 3870's are about 10&#37; better than SLI'd 8800 GT's

I have an 8800 GT coming tomorrow. but hopefully, I can get a couple of 3870's and a crossfire board soon.

The hardware I want is quite hard to actually get. I've been waiting 4 weeks for the 8800 GT, and it's finally coming.
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