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LF: Cross Fire Performance Comparison on the 4850s and 4870s

post #1 of 2
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I ran across a good online local deal last night and now have a stack of video cards (4x 4850 2x 4870). I'm kinda curious what the performance difference is for a cross fire set up, running a Dell Ultra Sharp 2407, with the 4850s xfired or the 4870s xfired.

I'd love to do the tests myself but my maximus formula doesn't seem to like me lately and needs a RMA and the AM2 board I grabbed yesterday needs a bios update for the chip I have so I'm out of luck on an xfire board atm.

If anyone has some good info of their owns or can direct me to somewhere that does I'd greatly appreciate it!
    
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CPUMotherboardGraphicsRAM
i7 4790k GIGABYTE G1 Gaming GA-Z97MX-Gaming 5 ASUS 390 STRIX G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin... 
Hard DriveHard DriveCoolingOS
Samsung 840 Evo 250gb x2 WD 3tb Green Corsair H80i Windows 10 
MonitorKeyboardPowerCase
3x Samsung 27" S27D390H Filco Brown Switch Corsair HX850 Corsair 330r Carbide 
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Logitech G500 Razer Sphex Logitech z5500 
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post #2 of 2
this is just instinct tellin me, 4850 bout 25% slower than 4870

so (100-25=75) 75x4=300

minus the 25% loss (avg) Xfire = 225

4870 CF = 185 (loss from Xfire less than 4x 4850)

I would say, GO for 2 4870 as they would take up alot less power than the 4850's and also leave room for tri 4870 rig which is always a fanny magnet
    
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Hard DriveOptical DriveOSMonitor
2x 250gb 16mb seagate barracuda's in raid 0 Dvd-\+ Rw Xp pro optimized 4 games Eizo 19" hd 
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perixx pearl EZ cool ps-05 650w Xblade Logitek mx518 
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