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  #21 (permalink)  
Old January 20, 2011, 08:57 AM
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Quote:
GTX 580 > GTX 470 = HD 6970 > HD 6950 = 5870 > GTX 470 = HD 6870 = HD 5850 > GTX 460 1GB = HD 6850.
Not exactly sure how to read what it is you're saying here, if you could explain in another way that would be great. Also,
Quote:
I personally would stay away from the 58xx series as they aren't really as good at dx 11 features as the other cards they match.
I've found several sites finding that HD 5870's in CrossFireX beat out HD 6870's in CrossFireX in not only DX11 but across the board. What I can't tell though is if the 5870's they use in the tests are the 1GB or 2GB versions, which have a rather significant price difference. I thought the entire enticement of the 6870's was that they were a close comparison to the 5870's at a lower price.

My major problem is that you can't ever find a review that compares all the cards you're considering.

Last edited by Dreamsickle; January 20, 2011 at 09:08 AM.
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  #22 (permalink)  
Old January 20, 2011, 08:59 AM
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This review compares most of those cards

EVGA Geforce GTX 570 Superclocked Review
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  #23 (permalink)  
Old January 20, 2011, 09:11 AM
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@Eldonko: If I'm not mistaken, out of that list you gave only the UD7 supports 16x bandwidth for each card.

After reading that review, I could take the 1GB HD 5870 I currently own, buy another one for CrossFireX and basically have near the best performance I can buy for under $500, right?
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Old January 20, 2011, 09:35 AM
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Scratch Sabretooth, AFAIK these are the only boards with NF200. NF200 it doesnt necessarily u more physical lanes though, it acts as a switch so chech the specs of the board for 16x bw
  • Gigabyte P67A-UD7
  • Asus Maximus IV Extreme
  • ASUS P8P67 WS Revolution
  • eVGA P67 Classified
  • MSI P67 Big Bang Marshall

Regarding your GPU question, yes I would say a second HD 5870 would be the best bang for the $$.
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Old January 20, 2011, 10:04 AM
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Gigabyte P67A-UD7: "2 x PCI Express x16 slots, running at x16 (PCIEX16_1, PCIEX16_2)"

Asus Maximus IV Extreme: "4 x PCIe 2.0 x16 (single @x16, dual @x8, triple @x8, x16, x16 )"

ASUS P8P67 WS Revolution: ""PCIe 2.0 x16_1 slot (single at x16 or dual at x8/x8 mode)"

eVGA P67 Classified: "1 x PCIe x16/x8, 1 x PCIe x8, 1 x PCIe x4, 3 x PCIe"

MSI P67 Big Bang Marshall: Supposed to have 8 PCIe x16 slots as well as Lucid Hydra (not sure that's a good thing).

After looking at ASUS, Gigabyte, MSI, and eVGA's websites the Gigabyte P67A-UD7 and MSI P67A-GDxx are the only P67 motherboards currently on the market that supports x16 bandwidth for two cards and since with the MSI P67A-GDxx motherboards you can't use 2-way+ SLI or CrossFireX with dual-slot cards since the front panel connectors are in the way the only one you're left with is the UD7. Go go MSI?
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Old January 20, 2011, 01:54 PM
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Your decision is made then isnt it?
Quote:
Originally Posted by Dreamsickle View Post
After looking at ASUS, Gigabyte, MSI, and eVGA's websites the Gigabyte P67A-UD7 and MSI P67A-GDxx are the only P67 motherboards currently on the market that supports x16 bandwidth for two cards and since with the MSI P67A-GDxx motherboards you can't use 2-way+ SLI or CrossFireX with dual-slot cards since the front panel connectors are in the way the only one you're left with is the UD7.
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  #27 (permalink)  
Old January 20, 2011, 07:53 PM
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Yeah, I just think it's really ridiculous that they'd design something like that. While buying another 5870 for CrossFireX would be a great choice for the money, it would mean my other computer would be non-functional and you always need another computer when building a new one I'm going to wait until January 25th when the GTX 560 comes out and see how it performs in SLI since the price point will probably be around $200-250 each.

Last edited by Dreamsickle; January 20, 2011 at 08:07 PM.
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Old January 20, 2011, 09:06 PM
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Quote:
Originally Posted by Dreamsickle View Post
Not exactly sure how to read what it is you're saying here, if you could explain in another way that would be great. Also,

I've found several sites finding that HD 5870's in CrossFireX beat out HD 6870's in CrossFireX in not only DX11 but across the board. What I can't tell though is if the 5870's they use in the tests are the 1GB or 2GB versions, which have a rather significant price difference. I thought the entire enticement of the 6870's was that they were a close comparison to the 5870's at a lower price.

My major problem is that you can't ever find a review that compares all the cards you're considering.
When I use the " > " sign that means that we're stepping down in performance (i.e. 580 > 570 means that the 580 is more powerful than everything after the > sign). Then when I use an " = " sign, that means that all items perform about the same level (i.e. GTX 470 = HD 6870 = HD 5850 means that all 3 of these cards offer about the same performance).

If you notice, I've listed the 5870 as a more powerful card than the 6870 as it offers more raw power, but isn't as optimized for dx 11 features like tessellation as well as AA. I didn't price compare the 5870 or 5850s as I was never interested in those cards due to the weaker optimization. Also, (maybe new drivers changed this) the 5870 never used to scale, in crossfire, as well as nvidia cards and the 6800 cards when they came out. The 6870s, as I have specified, are supposed to be a match for the 5850s.

You will find that many reviews will compare similar games with similar systems and you can use that to link the different cards to each other (as best as possible).

As for your thoughts on PCIe lanes bandwith, you won't need more than 8x per card unless your doing (at a minimum) a GTX 480 or HD 6950. A GTX 480 @ 700Mhz will usually lose less than 5% fps by going from 16x to 8x, that's almost nothing. The only reason to buy for x16 lanes is for GPUs that come out at the end of 2011 or start of 2012. Even then, it's hard to say how important 8x vs 16x will be on anything other than the 'top end' cards.

Also the P/H67 chipset only supports x16 PCIe lanes for bandwith, so any mobo that offers 16x/16x slots is using technology such as a NF200 chip which 'mirrors' repeatable data to both lanes. What does this mean? It means that NF200 x16 lanes will never be as fast as real x16 lanes and in rare cases will not be any faster than 8x lanes IF there is no data that can be duplicated!

Last edited by draemn; January 20, 2011 at 09:17 PM.
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  #29 (permalink)  
Old January 21, 2011, 01:11 AM
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Quote:
Originally Posted by Dreamsickle View Post
Yeah, I just think it's really ridiculous that they'd design something like that. While buying another 5870 for CrossFireX would be a great choice for the money, it would mean my other computer would be non-functional and you always need another computer when building a new one I'm going to wait until January 25th when the GTX 560 comes out and see how it performs in SLI since the price point will probably be around $200-250 each.
Another optiopn. An HD 5870 in a back up pc would be a waste. CF it in your new rig and get something in the lines of the upcoming HD 6770 for you old rig. :)
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  #30 (permalink)  
Old January 21, 2011, 03:45 AM
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Originally Posted by Luay79 View Post
Another optiopn. An HD 5870 in a back up pc would be a waste. CF it in your new rig and get something in the lines of the upcoming HD 6770 for you old rig. :)
Now if only it hadn't been confirmed that the 6770 is a re-badged 5770 with 1.4a HDMI, for manufacturers only.
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