xeon E5-2620 v2 vs xeon X5650

[Kilgore23]

Hey all, can someone please help me understand if and why the e5-2620 v2 or non v2 would be faster than the x5650?

In scenarios such as:

Single threaded application where they recommend 3ghz for the single thread

Dual threaded application where they recommend 2.5 ghz for dual core



e5-2620 v2: http://ark.intel.com/products/75789

x5650: http://ark.intel.com/products/47922/Intel-Xeon-Processo...(12M-Cache-2_66-GHz-6_40-GTs-Intel-QPI)

I understand the e5-2620 v2 has a little more cache by 3mb, but has much less clock speed of 2.1 - 2.6 ghz.

So how is the e5-2620 v2 any faster for the scenarios mentioned above over the x5650 which has a good amount more clock speed of 2.66 - 3.06 ghz?

Any help much appreciated

 

[Kilgore23]

Bup

 

[ShintaiDK]

One is a Westmere uarch with a 3.06Ghz turbo and the other Ivy Bridge with a 2.6Ghz turbo. Ivy Bridge however got higher instruction per clock rate that will offset the lower clock and make it faster. In something like Cinebnech, just to show an example that dont benefit from new instructions, the Ivy Bridge is around 35% faster clock for clock than the Westmere.

Also you need to specify what software you are talking about. If its AVX enabled for example, then the Ivy Bridge will be much faster.

Also the platforms are entirely different. So beyond CPUs, there must be something else.