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XFX 4870 Crossfire question...

Last response: in Graphics & Displays
June 28, 2009 7:41:03 PM

Right now I'm running a HIS HD 4870 512mb video card, which has unfortunately gone bad on me and will need to be returned to the manufacture. I've been wanting to have a crossfire set up for a while now but until now I've never had the motivation to blow money on a new card. I know when doing a crossfire on two cards it's a good idea to have two cards with the same memory size as well as having the same GPU and Memory clocks. I can't find the same HIS 4870 I bought back in October so I'm looking at getting a ...the problem is the memclock on my old 4870 is 900MHz and memclock the XFX card is 3600MHz. My understanding is that when you crossfire two cards with different clock speeds it takes the fastest card and slows it down to the slowest cards speed. In this case it would under clock the XFX's memclock to a 1/4 of what it should be! Does anyone know if this would cause any problems for the XFX card? If not do you think that it would be a good idea to CrossFire these two cards or should I find another card to CrossFire with my HIS?

HIS HD 4870
Video Memory: 512mb
Memory Type: GDDR 5
Core Clock: 750MHz
Memory Clock: 900MHz
a b U Graphics card
June 28, 2009 7:55:20 PM

The memory is 900mhz ddr5, which is quad pumped. So its effective speed is 3600mhz. They're the same speed, it's just written differently.
June 28, 2009 7:56:57 PM

Awesome! Thanks for the help :D 
June 28, 2009 8:00:42 PM

i am pretty sure the the 3600mhz is after the actual one is multiplied but which number i forgot :whistle:  (which i am pretty sure its 4), but there is no way there would be that much difference... thats a HIS 4870, possibly even the same as your and as you can see its 3600mhz also

you have nothing to worry about

Edit: woops little late