ZOTAC GeForce GT 640 2 GB 28

ZOTAC GeForce GT 640 2 GB

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About one month ago, NVIDIA released their GeForce GT 640 Series without much fanfare. The new GT 640 is based on the company's award-winning Kepler architecture, but uses a smaller, less powerful graphics processor than the GK104 GPU, we've come to love on GTX 670, 680 and 690. GT 640 also does not feature NVIDIA's boost clock algorithm which dynamically adjust clocks to increase performance if the card is running below its TDP limit.

The GeForce GT 640 is based on a 28 nm GK107 GPU, with a CUDA core count of 384. Unlike its high-end brethren, the card uses cheaper, but slower DDR3 memory, which you would also find on your mobo's memory modules, for example.

ZOTAC's GT 640, is one of the few single-slot GTX 640 cards on the market, which means it might be interesting for HTPC users. Clocks have remained at the NVIDIA default of 891 MHz GPU and 900 MHz memory. While there are variants with 1 GB memory, ZOTAC has put 2 GB on the card, whether this makes much sense is something we will know at the end of the review. Price-wise GT 640 is definitely not cheap, with a current retail price of $110 there are many options to consider, cheaper and more expensive.

GeForce GT 640 Market Segment Analysis
GT 520
HD 5550
GT 440
HD 5670
GT 640
HD 6670
GTS 450
HD 5750
HD 5770
HD 7750
GTX 550 Ti
HD 6790
HD 6850
Shader Units4832096400384480192720800512192800960
Graphics ProcessorGF119RedwoodGF108RedwoodGK107TurksGF106JuniperJuniperCape VerdeGF116BartsBarts
Memory Size1024 MB1024 MB1024 MB1024 MB2048 MB1024 MB1024 MB1024 MB1024 MB1024 MB1024 MB1024 MB1024 MB
Memory Bus Width64 bit128 bit128 bit128 bit128 bit128 bit128 bit128 bit128 bit128 bit192 bit256 bit256 bit
Core Clock810 MHz550 MHz823 MHz775 MHz902 MHz800 MHz783 MHz700 MHz850 MHz800 MHz900 MHz840 MHz775 MHz
Memory Clock800 MHz1000 MHz800 MHz1000 MHz891 MHz1000 MHz900 MHz1150 MHz1200 MHz1125 MHz1026 MHz1050 MHz1000 MHz
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