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Crossfire 7870 vs single 7950 AND need new psu or not?

Poll Results: Whats a better option...

 
  • 100% (1)
    Buy one more 7870 and crossfire?
  • 0% (0)
    Replace current 7870 with a 7950?
1 Total Vote  
post #1 of 9
Thread Starter 
Hi guys,

This is kinda a 2 part question...

1) I currently have an XFX R7870 black edition... and i'm wondering if adding another one of these in crossfire would be better than buying a 7950 to replace it. I'll only be gaming on 1x 1080p monitor, but use 2 for other things like video editing and may upgrade to 3.

2) if i was going to crossfire two of the 7870's would a 750w psu do? or should i go higher like 850w or 1000w?

i currently have:

AMD FX-8120 rated at 125w i think?
3x HDD and 1 SSD
1x optical drive
1x sound card

Plus GPU/s... My 7870 uses 250w... im unsure on the 7950

Cheers Guys,

Josh
post #2 of 9
Quote:
Originally Posted by josh1quattro View Post

Hi guys,

This is kinda a 2 part question...

1) I currently have an XFX R7870 black edition... and i'm wondering if adding another one of these in crossfire would be better than buying a 7950 to replace it. I'll only be gaming on 1x 1080p monitor, but use 2 for other things like video editing and may upgrade to 3.

2) if i was going to crossfire two of the 7870's would a 750w psu do? or should i go higher like 850w or 1000w?

i currently have:

AMD FX-8120 rated at 125w i think?
3x HDD and 1 SSD
1x optical drive
1x sound card

Plus GPU/s... My 7870 uses 250w... im unsure on the 7950

Cheers Guys,

Josh

I run two 7950s with a 650w just fine. That being said idk if a 7870 uses more or less power than a 7950 im gonna guess less since it has less horsepower
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CoolingCoolingCoolingOS
XSPC Raystorm CPU BLOCK EK Nickle/Acetal 290x Block  2x XSPC 240MM Radiator Windows 8.1  
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Qnix Evolution II  Cooler Master Quickfire Rapid  Cooler Master V1000 Fractal Arc Midi R2 
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by HardwareDecoder View Post

I run two 7950s with a 650w just fine. That being said idk if a 7870 uses more or less power than a 7950 im gonna guess less since it has less horsepower
Cheers for the quick reply, out of interest... what PSU is it? because i dont know if mine is 80% certified or anything like that. tongue.gif i know mines a pretty cheap one, and im due an upgrade, just dont want to get an 'overly' powerful one smile.gif
post #4 of 9
Resolution?if you are in 1080p+ you are fine hd7870cfx but if you have a lower resolution....waste of money. 7870Cfx=gtx titan performance
Wanted: Wanted: R9 290/X/R9 390/X
$165 (USD) or best offer
  
Reply
Wanted: Wanted: R9 290/X/R9 390/X
$165 (USD) or best offer
  
Reply
post #5 of 9
its a rebranded seasonic psu so a quality 650w psu.
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Gskill 4x4gb @ 1600mhz Samsung Evo 120gb Samsung Evo 120gb 2TB Seagate Game storage drive  
CoolingCoolingCoolingOS
XSPC Raystorm CPU BLOCK EK Nickle/Acetal 290x Block  2x XSPC 240MM Radiator Windows 8.1  
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Qnix Evolution II  Cooler Master Quickfire Rapid  Cooler Master V1000 Fractal Arc Midi R2 
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post #6 of 9
Thread Starter 
You have pretty much answered all my questions apart from one, How does Crossfire split the resources over 2 cards? like the Vram even if im only using one output on the one card?
post #7 of 9
Quote:
Originally Posted by josh1quattro View Post

You have pretty much answered all my questions apart from one, How does Crossfire split the resources over 2 cards? like the Vram even if im only using one output on the one card?

i believe each card has identical vram content
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Hard DriveHard DriveHard DriveOS
Samsung 2TB WD Black 2TB  WD Green 2TB Windows 8 x64 
MonitorKeyboardPowerCase
Dell P2414H Filco Magestouch MX Brown Tenkeyless Corsair CX430 v2 Antec 300 
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post #8 of 9
Thread Starter 
Okay cool, Cheers guys. Upgraded psu and a second 7870 it is smile.gif
post #9 of 9
OP there should be no doubts. you are willing to buy a HD 7870 which costs 150 - 170 pounds. sell the HD 7870 and grab a R9 290. the consistency of a single GPU is unmatched. faster than HD 7870 CF. you seem to be interested in going for 3 x 1080p in future. the R9 290 with 4GB VRAM keeps you ready for that. btw your psu is fine.

http://www.scan.co.uk/products/4gb-msi-radeon-r9-290-28nm-5000mhz-gddr5-gpu-947mhz-boost-1000mhz-2560-streams-dport-dvi-hdm
http://www.overclockers.co.uk/showproduct.php?prodid=GX-337-SP&groupid=701&catid=56&subcat=1752
Edited by raghu78 - 11/5/13 at 7:24pm
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