How much difference does the shader clock make on a 580?

[PhotoGuy]

Ok, I have a screen res of 2560 x 1440 and want a single card solution. So I am thinking of waiting a few days and spending another £50 on the 3gb version of the MSI GTX Lightning.

Now I've seen different views on 3mb of ram on 580s, apprantly the 256 mem chips they use in the 3mb versions has a higher latency.

But what difference does dropping the Shader Clock from 1747MHz on the 1.5gb to 1664MHz make?



MSI GeForce GTX 580 Lightning 1536MB GDDR5 PCI-Express Graphics Card
Core: 832MHz, Memory: 1536MB 4200MHz GDDR5, Stream Processors: 512, Shader Clock: 1747MHz, SLI Ready, PhysX/CUDA Enabled, 3 Years Warranty.


MSI GTX 580 Lightning Xtreme Edition 3072MB GDDR5 PCI-Express Graphics Card
Core: 832MHz, Memory: 3072MB 4200MHz GDDR5, Stream Processors: 512, Shader Clock: 1664MHz, SLI Ready, PhysX/CUDA Enabled, 3 Years Warranty.

 

[PhotoGuy]

For your resolution you would want the 3gb version anyway

Sold!