How does the Radeon HD 6570m video card stack up?

Radeon HD 6570m Specs:
Memory: 1GB DDR5
Core Clock: 650 MHz
Memory Clock: 900 MHz
Memory Bus Width: 128 bit

Compare this to the HD 6770m:
Memory: 1GB DDR5
Core Clock: 725 MHz
Memory Clock: 900 MHz
Memory Bus Width: 128 bit

The 6770m also has higher fillrates (pixel and texture).

Obviously the 6770m is a better card, but how much better? And how does the HD 6570m compare to a 2048MB DDR3 nVIDIA GT 555M video card?

 

this may help you a little bit: Mobile Graphics Cards - Benchmark List - Notebookcheck.net Tech

 

The problem with that chart is it doesn't show which type of memory the cards are using. For instance, the gt 555m and the 6570m can come with ddr5 or ddr3; which does this chart show?

I was under the impression that ddr5 video cards outperformed ddr3 video cards, so I find it hard to believe that a ddr3 gt555m is better than a ddr5 hd 6570m

Ok, so it looks like the gt555m is only ddr3, but the HD 6570m comes in both variants, so which one does the chart show?

 

6570m with gddr5 gives you about 1300 in 3dmark11/10k in 3dmark06, whereas the 6770m with gddr5 gets 1600/12k respectively

it is about the same/slightly (5-10%) slower than 6750m, which puts it about 30% slower than the 6770m (e.g. if you get 30fps on 6570m, you'll get about 40fps on 6770m)

source: i have both and benchmarked both (dv6t-4000 vs dv6t-6000)

555m is just a faster card, so it is faster than the 6570m even with lower memory bandwidth. gddr3 555m is about the same as gddr5 6770m, it's rather pointless to nitpick about which is better as whatever difference there is is very marginal.