Topic Title: AMD HD 7950 (Gigabyte) with R9 280X in Crossfire
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Created On: 10/24/2013 04:37 AM
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 10/24/2013 04:37 AM
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Oreanikon
Peon

Posts: 2
Joined: 10/24/2013

Good morning everyone

Since it is possible to combine a 7900 Series with the new one (R9 2XX) i played with the thoughts to upgrade my pc. 

My system at the moment:
i7 2600K
16Gb RAM @ 1600Mhz
AMD HD 7950 (Gigabyte) @ 1020Mhz

On the official AMD site they say, that it is possible to combine these two cards. But I'm not sure if there is any perfomance loss...

What would you do? And no, I don't gonna buy a second 7950

Greez
Me 

 

 10/24/2013 11:23 AM
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Slayerx
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Joined: 09/16/2012

The R9 280X looks to be a rebranded 7970 that can support directX 11.2 so I can't see any reason why it would't work.

So yeah, I would try it



-------------------------

FX 8320// Asus Sabertooth R2.0 // HIS R9 280x //8Gb of 1866Mhz ram, H50 cooling, HX850W psu all stuffed into a NZXT Phantom case.


Was a member of AMD Processer forum since 2008. Last post count 1818.

 10/24/2013 11:45 AM
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Oreanikon
Peon

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Thanks for the answer.

I've a fear of wasting money^^

And if the 280X downclocks itself because the 7950 is too slow for it, it's a waste of money. I found the following answer from a tomshardware-user:
"You can but it will slow the other card down. The R9-280X is the HD 7970. When the R9-280 is released, it will be the same as the HD 7950. I would wait for that one because it will be cheaper and will give you the same power. Having said that, the HD 7950 can currently be had for $200 so you might just crossfire that." 

Does the 7950 slow the 280x down even if it is overclocked? Means: Does the 280x just uses (per example) as much shader units as the 7950 got? 
I just want to be sure, that i understood how it slows down. It would be *****if both card exatly render 50% of the final picture. Even if the 280x sleeps while rendering while the 7950 is working as much as a indian childworker (sorry for the offensive joke).

I'd appreciate it if someone would upload a benchmark or something  

 10/26/2013 05:22 PM
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druuzil
Grinding Levels

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Joined: 10/26/2009

The 280x is a direct rebrand of the 7970.  They have almost identical specs, except as SlayerX said, the 280x supports DirectX 11.2.  Your experience should closely match a 7970 + 7950 crossfire setup.



-------------------------

My Rig:

i7 3930k w/Corsiar H100i
Gigabyte X79-UP4 Motherboard 
Creative SB Recon3D 
2x 128GB Kingston SSDNow! SATA III in RAID 0 
2x Sapphire R9 290x in Crossfire
Antec TruPower 1000w PSU
LG Blu Ray Burner
1.5TB Storage
Corsair Vengeance 16GB DDR3 1600
Cooler Master HAF 932

 10/26/2013 07:12 PM
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Vantharas
Polygon Pusher

Posts: 3505
Joined: 03/01/2009

Originally posted by: Oreanikon Thanks for the answer.

 

I've a fear of wasting money^^

 

And if the 280X downclocks itself because the 7950 is too slow for it, it's a waste of money. I found the following answer from a tomshardware-user: "You can but it will slow the other card down. The R9-280X is the HD 7970. When the R9-280 is released, it will be the same as the HD 7950. I would wait for that one because it will be cheaper and will give you the same power. Having said that, the HD 7950 can currently be had for $200 so you might just crossfire that." 

 

Does the 7950 slow the 280x down even if it is overclocked? Means: Does the 280x just uses (per example) as much shader units as the 7950 got?  I just want to be sure, that i understood how it slows down. It would be *****if both card exatly render 50% of the final picture. Even if the 280x sleeps while rendering while the 7950 is working as much as a indian childworker (sorry for the offensive joke).

 

I'd appreciate it if someone would upload a benchmark or something

 

 

 

The 280X wouldn't downclock anything, however you would benefit from overclocking the 7950 to the 1.1ghz range. Then the 280X would work just fine with it. 



-------------------------

I5 3570K@4~5.0ghz: Gigabyte GA-Z77X-UD3H:Corsair Hydro H110 :16GB Corsair Vengeance DDR-3 1600: XFX Radeon 7950 @ 1100/1575 : Corsair AX 860 PSU: x1 WD Black 1TB HDD's: 90GB Agility 3: 960GB SSD : Creative Labs X-FI:Corsair 500R Arctic White Edition:3 22inch Monitors Eyefinity @ 5294x 1050 : Alienware Tact-X Keyboard: Razer Naga :Corsair Vengence 1500 Headset: Corsair SP2500 Speakers



Edited: 10/27/2013 at 02:42 PM by Vantharas
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