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PCI Express 3.0 vs. 2.0


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#1 TNF

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Posted 17 October 2014 - 09:09 AM

My new motherboard Gigabyte GA-970A-UD3P has PCI Express 2.0 slots.

 

Since I bought it, a coworker is offering me a Gigabyte Radeon HD 7950 3GB DDR5 (rev 2) for $50 ... but it is PCI Express 3.0

 

My instincts tell me I won't be noticing much of a performance difference by just keeping the 2.0 slot.

 

But, before I open the motherboard and do the upgrade next week, does anyone think it is worth replacing the MB to a PCIe 3.0 ?

 

 

Uses are Photoshop, Battlefield (multiplayer),etc.

 

 

Thanks.


Edited by TNF, 17 October 2014 - 09:11 AM.


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#2 jonuk76

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Posted 17 October 2014 - 10:12 AM

No it'll be fine.  The performance of the graphics card will not be restricted at all by the PCIe 2.0 x16 interface.  Some tests to show this - http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/23.html

 

It's actually not just the motherboard, the top end 990FX chipset doesn't support PCIe 3.0 either.  AFAIK you'd need to go with a different processor too (e.g. Intel Core 4xxx series) for PCIe 3.0.


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#3 TNF

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Posted 17 October 2014 - 10:21 AM

No it'll be fine.  The performance of the graphics card will not be restricted at all by the PCIe 2.0 x16 interface.  Some tests to show this - http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/23.html

 

It's actually not just the motherboard, the top end 990FX chipset doesn't support PCIe 3.0 either.  AFAIK you'd need to go with a different processor too (e.g. Intel Core 4xxx series) for PCIe 3.0.

 

Ah, ok.  I never considered the processor's influence.

 

Thank you for the response.



#4 jonuk76

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Posted 17 October 2014 - 11:22 AM

In the case of the AMD FX, I think they could do it, but there are no new chip sets for those processors that support PCIe 3.0, to my knowledge.  And no real reason for AMD to invest in developing them, till they release a new FX line up anyway (if/when that happens).  The 9xx chipsets are a few years old now.  In Intel's latest, a PCIe 3.0 controller is built onto the CPU itself.  I think this is also true of the AMD FM3+ APU's. 


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