The first new Kepler based graphic cards for OEMs have been released. There are 5 new cards slotted haphazardly into the series. However these 5 different cards share just three model number. Please look at the table below to see the new models and their differences, I was going to say ‘at a glance’ but it’s much more confusing than that.
|
GT 645 |
GT 640 |
GT 640 |
GT 640 |
GT 630 |
Architecture |
Fermi GF114 |
Kepler GK107 |
Fermi GF116 |
Kepler GK107 |
Kepler GK107 |
Stream Processors |
288 |
384 |
144 |
384 |
384 |
Texture Units |
48 |
32 |
24 |
32 |
32 |
ROPs |
24 |
16 |
16 |
16 |
16 |
Core Clock |
776MHz |
950MHz |
720MHz |
797MHz |
875MHz |
Shader Clock |
1552MHz |
950MHz |
1440MHz |
797MHz |
875MHz |
Memory Bandwidth |
91.9 Gb/s |
80 Gb/s |
43 Gb/s |
28.4 Gb/s |
28.5 Gb/s |
Frame Buffer |
1GB |
1GB/2GB |
1.5GB/3GB |
1GB/2GB |
1GB/2GB |
GPU |
GF114 |
GK107 |
GF116 |
GK107 |
GK107 |
Manufacturing Process |
TSMC 40nm |
TSMC 28nm |
TSMC 40nm |
TSMC 28nm |
TSMC 28nm |
TDP |
140W |
75W |
75W |
50W |
50W |
Taking the cards in turn:
GT 645, based on the previous generation Fermi core is essentially a rebranded GTX 560 SE card. Memory bandwidth is helped along by the GDDR5 clocked at 1914 MHz. The specification lists it as a 128-bit memory interface but this is probably a typo as everything else is the same as the GTX 560 SE. This is a dual slot cooler model.
GT 640, there’s 3 versions of this card, all sport a dual slot cooling solution but there is a wide range of differences in these cards architectures and performance, best illustrated by the table above.
GT 630, is a single slot Kepler based card, it’s got a nearly 10 per cent faster core clock than the nearest GT640 model but the memory bandwidth is listed at almost exactly the same figure. With all else seemingly equal including memory type and interface width of 128-bit this is confusing.
A GeForce GT 640 yesterday.
Other recent additions to the OEM line-up were the entry level GT 605 and GT 620, are also re-brands, basically higher clock speed versions of the GT 510 and GT 520.
These OEM cards are really going to confuse brand name PC buyers with all the flavours of GT 640 available on top of other variables that are sometimes and sometimes not listed on the side of the system box/on the retailer’s website. If you are tempted by the sleek lines and convenience of a pre-assembled PC you will have to do a good bit of research to know exactly what you are buying.