While NVIDIA doesn’t publically announce most of their OEM desktop graphics cards, they do update their website with the specifications of these cards, which is how we usually find out about them. Today has been no exception, and after NVIDIA's latest site update a bit of digging has unearthed the fact that NVIDIA has released their first Kepler cards for the desktop market. There are 5 new OEM desktop cards, composing a mix of both Kepler and Fermi: the GT 645, the GT 640, and the GT 630.

  GT 645 GT 640 GT 640 GT 640 GT 630
Stream Processors 288 384 144 384 192
Texture Units 48 32 24 32 16
ROPs 24 16 16 16 16
Core Clock 776MHz 950MHz 720MHz 797MHz 875MHz
Shader Clock 1552MHz 950MHz 1440MHz 797MHz 875MHz
Memory Clock 3.828GHz GDDR5 5GHz GDDR5 1.782GHz DDR3 1.782GHz DDR3 1.782GHz DDR3
Memory Bus Width 192-bit* 128-bit 192-bit 128-bit 128-bit
Frame Buffer 1GB 1GB/2GB 1.5GB/3GB 1GB/2GB 1GB/2GB
GPU GF114 GK107 GF116 GK107 GK107
TDP 140W 75W 75W 50W 50W
Manufacturing Process TSMC 40nm TSMC 28nm TSMC 40nm TSMC 28nm TSMC 28nm

If this product stack looks familiar, it should. It’s generally the same product stack as the GeForce 600 series Mobile lineup, except with higher clockspeeds. As with their mobile parts, NVIDIA is going to be mixing 40nm Fermi parts and 28nm Kepler parts into their desktop product stack, leading to a hilariously frustrating selection of video cards.

At the top of the new product stack we have the GT 645, which is a GF114 Fermi rehash. GT 645 has 288 CUDA cores enabled and paired with what’s listed as a very crippled 128bit memory bus. However considering the memory bandwidth NVIDIA lists for the card (91.9GB/sec) and the fact that they already have a very similar card in the GTX 560 SE, we’re confident that the 128bit bus in NVIDIA’s specs is a typo and that it’s actually a 192bit bus, and we are listing it in our charts accordingly. In any case you’re still looking at significantly less memory bandwidth the GTX 560 is typically paired with.

The next card is the GT 640, the GT 640, and the GT 640. Just like the GT 640M LE, NVIDIA is mixing Fermi and Kepler here in a very odd manner. We have a GT 640 that’s a full GK107 (384 cores) with GDDR5 memory and a fairly high clockspeed, a GT 640 that’s a binned GF116 (144 cores) with DDR3 memory, and a GT 640 that’s a full GK107 (384 cores) with DDR3 memory and lower clockspeeds. Not even the TDP or form factor is consistent among these cards; the GK107 DDR3 card is a low-profile 50W card, while the other two are full-profile 75W cards.

Update: 5/19 The final card is the GT 630, which is another GK107 part. This is a harvested one with 1 of 2 SMXes disabled, leaving 192 CUDA cores active. It's paired with DDR3 memory and a mid-range clockspeed, giving it a TDP of 50W. The most interesting part? It’s clocked higher than the equivalent GT 640 though the disabled SMX will do plenty to keep the GT 630 behind the Kepler GT 640.

It’s safe to say that at this point the OEM desktop video card market has turned into a similar mess as the OEM laptop market, and this latest round of video cards serves to cement that fact. As with the laptop market we’ve reached a point where it’s nearly impossible to tell which video card a product actually uses based on computer specs alone, and that’s worrisome. Accordingly, our best advice for buying an OEM desktop is the same as buying an OEM laptop: make sure you research what you're getting if you want faster GPU performance. It may not be possible to tell what video card is in use until a product has been reviewed.

Oh a final note, it’s interesting though not surprising that NVIDIA is releasing desktop GK107 cards to OEMs first. They did the same thing with the GT 200 series, which were NVIDIA’s first 40nm cards, and while these GT 600 cards don’t have the same distinction, the root cause – a lack of sufficient GPU supply – is the same. On a positive note however, this launch means that retail GK107 desktop cards – particularly a retail version of the GDDR5 + GK107 based GT 640 – can’t be too far away; we’d speculate a few months at the most. So budget desktop users shouldn’t be waiting too much longer for the 28nm generation to hit their market segment.


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  • formulav8 - Thursday, April 26, 2012 - link

    Typical greedy gut nvidia. They could care less about anything but their own wellbeing even at the expense of someone elses.
  • Metaluna - Wednesday, April 25, 2012 - link

    We should just call them all Bruce, to avoid confusion
  • akbo - Wednesday, April 25, 2012 - link

    Seriously the GK107 of the GT440 with the GDDR5 looks like a good card. Sub-75w and 384 cores may put it on a showdown with the radeon 7750. They are ruining a good card with bad branding.
  • akbo - Wednesday, April 25, 2012 - link

    oops I mean GT 640
  • Paul Tarnowski - Wednesday, April 25, 2012 - link

    Yeah, I can see how you could mix that one up.
  • geddarkstorm - Wednesday, April 25, 2012 - link

    I think you're still a bit off; don't you really mean the GT 640?
  • Bumtrinket - Monday, April 30, 2012 - link

    You're both wrong, it's actually the GT 640.

  • IcePhase - Wednesday, April 25, 2012 - link

    Yeah, the 7750 is approximately 1/4 of the performance of the 7970. The best GT 640 is has slightly less than 1/4 of the cores of a GTX 680. Seeing as how the GTX 680 beats the 7970 they should be trading blows depending on the game.

    My prediction:
    950MHz GT 640 > 7750 > 797MHz GT 640
  • Sabresiberian - Wednesday, April 25, 2012 - link

    I can't help but think Nvidia is trying to make it harder for people buying laptops and budget computers to tell what they are actually getting here.

    It simply shouldn't be that hard for the kind of person who buys a pre-built to tell what he's getting; there is too much confusion already, and many a customer is sold a machine that looks like a good deal but really isn't because the parts actually used aren't what they appear to be to those not doing detailed research. Mixing Fermi and Kepler SKUs is ridiculous.

    I tend to buy Nvidia over AMD, everything else being equal, but this kind of thing disgusts me. If you want to know why many people have a bad attitude towards big corporations, you can start by looking at practices like this. Only a crook tries to befuddle and confuse his customer.
  • medi01 - Wednesday, April 25, 2012 - link

    Despite having inferior, power hungry product, nVidia continued to dominate the market (60% vs 40% as of May 2011). Do you think they would achieve that without tricks like that? (comparing cherry picked overclocked cards vs stock on, coough, some review sites)

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