The GK107 based GT640 tested.

[CAT-THE-FIFTH]

The HD7750 GDDR5 seems to beat the pre-overclocked GT640 DDR3 version tested:

http://translate.googleusercontent....&usg=ALkJrhiyRLALGNv-F14-nRVkEL7SXJX97g#para8

The card also has turbo boost too. The base clockspeed is 902MHZ,although the Galaxy GT640 tested has a 100MHZ overclock but uses DDR3. Power consumption of the pre-overclocked card and the HD7750 looks similar. It will be interesting to see how much faster a GDDR5 version would be,when tested,although power consumption might be higher than the equivalent DDR3/GDDR3 cards.

It seems the GK107 is slightly bigger(130MM2) than the Cape Verde GPU(123MM2) found in the HD7750(800MHZ core clock in the card tested) and HD7770. I suspect especially with the HD7750 getting a bump in clockspeed from 800MHZ to 900MHZ now,it should be quite competitive still with the GDDR5 version of the GT640.

OTH,pricing is the other important factor too.

 

[CAT-THE-FIFTH]

RRP looks fail at around $110:

http://www.techpowerup.com/167121/PNY-Unleashes-New-Verto-GeForce-GT-640-Graphics-Card.html

It is the same as the HD7750 GDDR5:

http://www.techpowerup.com/reviews/ASUS/HD_7750/

Edit!!

It seems to be around $130 direct from PNY:

http://www3.pny.com/GT-640-1024MB-PCIe-P3191C523.aspx

 

[CAT-THE-FIFTH]

Toms Hardware review:

http://www.tomshardware.com/reviews/geforce-gt-640-review,3214.html

It seems the GPU measures 118MM2 and has 1.3 billion transistors.

 

[JonSmith]

Impressive, it has less memory bandwidth than my 7800GS from 6 years ago, what were they thinking?

 

[Cyber-Mav]

Impressive, it has less memory bandwidth than my 7800GS from 6 years ago, what were they thinking?

yet the gt 640 performs 5 times faster

 

[CAT-THE-FIFTH]

It looks like the GT650M is around 20% faster than the GT640M due to GDDR5:

http://forum.notebookreview.com/gam...9-gt650m-ddr3-vs-gddr5-difference-tested.html

Both are GK107 based and have 384 shaders.

The GT650M has a higher clockspeed than the GT640M too:

http://www.notebookcheck.net/NVIDIA-GeForce-GT-650M.71887.0.html

 

[CAT-THE-FIFTH]

Anandtech test the GT640 DDR3:

http://www.anandtech.com/show/5969/zotac-geforce-gt-640-review-/1

It seems the HD7750 consumes a similar amount of power and is much faster too.

However,the GT640 DDR3 does look good for media use.