Crossfire - 16x16 necessary?
So I've been doing quite a bit of reading on this, and it seems to be basically a coin toss on people's opinions. The question being: Is full 16x16 2.0 crossfire support that large a jump in performance over 8x8 2.0? (Real world gaming)
The situation is that I have an 8x8 2.0 board (see primary in sig) and I'm going to be running 2x 4890's in crossfire. Should I seriously consider moving from a 790x to a 790fx board to get 16x16? Obviously I understand that benchmark numbers are higher for the 16x16, but does current game development take advantage of the jump? Is it really worth the $150 - $200 to get a new board? Is crossfire in 8x8 a waste?
And before I get comments about moving to a new board for 16x16 AND DDR3, forget it. I don't want to spend the money it'll take to buy the RAM. The only real option I'm considering is a jump to one of the few AM3 DDR2 boards with 16x16. Probably this one. But I don't want to drop the money for it unless it's a noticeable performance boost.
Thoughts? Any educated input would be appreciated. (Please list reasons for answers, not just assumptions.)
With 5970's perhaps, with most other cards, while its not an ideal set up, there are very little bottlenecks to speak of
Thanks for responses. That makes me feel a little better since I'm already having to buy a new PSU to do this. Of course, I could have bought an fx to start with, but I never really expected to be running crossfire.
I saw a review somewhere that showed real world performance differences between assorted configurations, but I can't find it now. I'll keep looking IIRC for the most part, with the cards available at the time, x8/x8 was sufficient.
http://www.tomshardware.com/reviews/...ress,2095.html about 1 year old results
Here you go: AMD Radeon HD 5870 PCI-Express Scaling :thumb:
I will sale the 4890 and get a 5870, and here why
you already ready to may be spend $ 200 for a new board, and an other $ 200 for an other 4890, so $ 400, if you sell the 4890 , $ 160, that make you $ 560 for a 5870
i test the crossfire and i was not impress. Crysis was slower, and i have few bug that was repeatable in xfire but not in single mode
and don't forget the power usage will be less too, same for the heat
I sell my second 4890 for this reason. i prefer have a single card now
Actually, I'm looking at NOT buying a new board. And I already have the second 4890 shipping to me. The only thing I'm short at the moment is the PSU. (Only running a 550 atm) So I don't want to sell 2 4890's and have to still spend another $200 - $300 on top of that for a GPU.
Thanks for the link IRQ. Looks like the difference between 8x and 16x is extremely minor, even in a card much faster than mine. :thumb:
yes im pretty sure you need at least a 650 for a dual 4890 setup
you could have gotten away with 2 5770's with it probably as the power req is alot less.
but your not. so go get yourself a nice shiny new power beast :thumb:
Actually, an XFX 850W Black Edition is in my future. =)
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