4850 CF on a P45 vs. x48

I'm almost finalized on my build which is super exciting...but I am still iffy about my motherboard choice. I am not a super picky person when it comes to max FPS, as long as it's smooth.
I want to spend the least money, for the best quality/performing parts. I want to hit that "sweet spot" where solid performance doesn't come with a premium price, bang for buck build. I hear that 4850 CF running on x8 lanes is pretty much right up against 4850 CF running on x16 lanes because the cards aren't able to fully saturate the slots even at x8. Can anyone provide benchmarks to support this or prove it false?

I am deciding between the following two mobos:
Asus P5Q Pro P45 <---$138
http://www.ncix.com/products/index.php?sku=30418&vpn=P5Q%20Pro&manufacture=ASUS

Gigabyte DS4 x48 <---$248
http://www.ncix.com/products/index.php?sku=29821&vpn=GA%2DX48%2DDS4&manufacture=Gigabyte

It's about $110 difference between the two...I don't mind paying the extra IF the performance boost is only >10%, but if it's just a little more FPS here and there, I'd rather drop the difference into something else like a 24" monitor.
But if two x16 lanes will significantly help with future games like starcraft 2 and d3 i'd be more than willing.
Help please! I'm getting antsy to order my build :(
12 answers Last reply
More about 4850
  1. http://www.tweaktown.com/articles/1472/intel_p45_vs_x48_crossfire_performance/index.html

    LOL, you've got an interesting problem there. On a 22" monitor (1680x1050) the P5Q Pro will be just fine, IMO. But, if you get the P5Q Pro and use the savings to upgrade to 24", the P5Q Pro is no longer that great. Sorry, man. From the benchmarks I've seen, 24" + X48 is OK, 22" + P45 is OK, but 24" + P45 is not OK.

    Maybe you should get the P5Q Pro and stay at 1680x1050 and use the savings for something else.
  2. Your link to the P5Q Pro would cost you $156. Add the current promoid and get it for $139.
    http://www.ncix.com/products/index.php?sku=30418&vpn=P5Q%20Pro&manufacture=ASUS&promoid=1042
    IIRC it's valid until Aug 12.

    Try adding &promoid=1042 to the URL for each thing you buy from NCIX, you might get more savings.
  3. I can't believe TweakTown is still the only site to have an 8x vs 16x CrossFire comparison for RV770. Given ATI's big focus on multi-GPU this generation I would expect to see a lot more articles like that.

    As it is, I take TweakTown's conclusions with a grain of salt; that site has always come off as a bit amateurish to me.....
  4. I would definitely go with an X38/X48 motherboard for CrossFireX especially at 1920x1200. Maybe not if at 1680x1050, but at 1680x1050 do you need CrossFire? You could go with a single 4870 at that resolution, just another choice.
  5. The cheapest X38 board is $179 at newegg...well worth the extra $20-30 over a P45.
  6. Get the ASUS P5E Deluxe. It is the sames as the Rampage Formula minus the LCD Poster and the onboard buttons and its 219.99 and The Rampage Formula is a great board.

    1Haplo
  7. Get a P5Q pro and a 4870x2. Kill all birds with one stone.
  8. homerdog said:
    I can't believe TweakTown is still the only site to have an 8x vs 16x CrossFire comparison for RV770. Given ATI's big focus on multi-GPU this generation I would expect to see a lot more articles like that.

    As it is, I take TweakTown's conclusions with a grain of salt; that site has always come off as a bit amateurish to me.....


    There was another one, in Swedish, translated with Google, but I forgot the URL, sorry. That one showed smaller differences between P45 and X48 than tweaktown's. Now of course, I never heard of that site before, so I'll need a grain of salt for it too :)
  9. roadrunner197069 said:
    Get a P5Q pro and a 4870x2. Kill all birds with one stone.


    Yeah, if you can wait for the 4870x2. With one of those 4870x2, you can even save more money with a single-slot MB. Say, GA-EP43-DS3L around $100, etc.
  10. I saw at least on other review of the P45 vs X38/X48 and it showed less of a difference than TweakTown, but they used cards much slower than the 4850 which would explain the difference.

    I'm surprised too that Toms, Anand, XBIT, etc... have not done a good P45 CF test.
  11. So, I guess, with HD 4870 cards the difference would be bigger than tweaktown showed with HD 4850 cards...
  12. ^Well yes, since the 4870 is faster I suppose it is more likely to be bottlenecked by the PCIe bus, but I still doubt it makes much difference outside of theoretical tests. I would like need to see some benchies showing situations where the X48 is playable when P45 is not before jumping to the conclusion that X48 is 'necessary'. I mean X48 boards are quite a bit more expensive than P45 boards, not to mention the fact that the P45 chipset is better than X48 in other areas...

    It would be interesting to see some more data similar to what TweakTown has focusing on minimum FPS. I suspect that is where you'd see the biggest differences.
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