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标题: NVIDIA 手头有两个版本的实作 kepler 芯片（GK107/GK117），但是大芯片版本还没出来 [打印本页]

作者: Edison 时间: 2011-9-21 08:58
标题: NVIDIA 手头有两个版本的实作 kepler 芯片（GK107/GK117），但是大芯片版本还没出来
http://semiaccurate.com/2011/09/20/exclusive-nvidia-has-two-keplers-in-house-but-not-the-big-one/

Kepler parts taped out and likely back in house by now. They are however, not the fire-breathing big chips you would expect.Sources tell SemiAccurate that the first Kepler chips taped out about three months after the first 28nm Fermi shrink taped out. If you remember when we exclusively told you about the dates on those about a month ago, now there are a few more details to add.

First off are the parts themselves, there are two, GK117 and GK107. GK117 was first, and sources describe it as a hybrid Fermi/Kepler part that doesn’t have a display controller. It isn’t a GPU, and it is, based on the code name, very small, so what it is useful for, if anything, is a mystery. This might just be a test chip with Kepler shaders and Fermi interconnects, but who knows?
GK107 is pretty obviously a small laptop part. If you recall, the GF108 and GF106 were the small and mid-range laptop parts in the Nvidia line, the GK107 looks to be a slightly above miserable performance chip. Where Nvidia hopes to sell it depends on performance, but that market is getting awfully thin because of Llano and Sandy Bridge. Either way, don’t expect much other than a price/performance volume laptop part.

That brings us to the big questions, why not a GK100? Where is the big chip? Why did it not tape out first? The answers are; damn good question, not in Hsinchu, and possibly a big problem. There are two overarching possibilities as to why GK100 is MIA, and neither is good. Normally you tape out the big, difficult chip first, and then dice it when the big one is debugged fully. The idea is that any problems will crop up in a big die, but problems in smaller dies may not be everything you encounter on something 4x as large. Just ask Nvidia engineers about GF100 for more on that.

Small chips are easier to debug than larger chips, and easier to design, verify, make boards for than the bigger parts. Small chips also have vastly higher yield than larger chips of the same architecture as well. Small chips first looks to be a time-to-market strategy and/or a short term profit maximization strategy, there are serious long term scheduling problems with doing it that way because your roadmap suffers.

So that brings us to the technical side of why the small die GK107 first? 28nm yield problems? Could the process be the reason? Could the interconnect be as borked as insiders tell us it is, leading to “Fermi II: The smoke also rises”? Who knows, but not doing the big part first is seriously puzzling, and will probably bite Nvidia in the ass. Luckily, they know how to deal with that kind of issue, and the list of valued partners to blame is undoubtedly being drawn up already.

That gets us to scheduling. The first Nvidia 28nm parts are scheduled to sample around October 1, and they are set to be delivered in volume in late December, call it January 1, 2012. The first Keplers taped out three months after the 28nm Fermi chips, so you are looking at April 1 for Kepler. The small Keplers. Not the big Keplers. If A0 silicon works perfectly.

28nm shrinks are a simple thing to do compared to a new architecture. If Nvidia has to do any spins of GF107, you will need at least 6 weeks for every spin, so April 1 becomes May 15 for A1, July 1 for A2 etc etc. Q1 is unlikely to see Keplers in anything other than PR form.

Moving back to the big Kepler, the one the fanbois want, it is still MIA. It is unlikely to tape out until GK107 is fully debugged, and then add a few weeks for the fixes to be backported and those changes laid out. Because of the big chip/small chip problems, there is likely to be an additional spin or two on top of the GK100 tape out, so more time there. Short story, the Kepler part you are expecting is probably mid-2012 best case.S|A

作者: 格格不入 时间: 2011-9-21 09:00
期待中快来吧

作者: iamw2d 时间: 2011-9-21 09:07
...还真有gk107

作者: 66666 时间: 2011-9-21 09:10
难不成这次NV也用小核心策略了？

作者: Edison 时间: 2011-9-21 09:11

iamw2d 发表于 2011-9-21 09:07
...还真有gk107

其实应该是 GK107 / GK104。

作者: gz_easy 时间: 2011-9-21 09:49
难道也和AMD一样，先出下一代notebook GPU？

作者: fengpc 时间: 2011-9-21 10:20
本帖最后由 fengpc 于 2011-9-21 10:25 编辑

GF117是给Ivy Bridge用的。先出小芯片是吸取了当年GF100的教训了

作者: 骨刺 时间: 2011-9-21 11:33
NV转舵的能力还是比较一流的什么流行它玩什么~至少能不倒闭

作者: luckissy 时间: 2011-9-21 11:36
NV还是很有潜力的

作者: askwex 时间: 2011-9-21 11:49
等GM。。。

作者: 花の庆次 时间: 2011-9-21 12:01
能透露点性能就可以了

作者: GTX999 时间: 2011-9-21 12:01
我擦。117都有
了

作者: goldman948 时间: 2011-9-21 12:32
第一代应该都叫gk10x不可能有gk11x.

作者: fengpc 时间: 2011-9-21 13:09
好奇RV1030那么早流片还屁都没放一个出来，出问题了吗？

作者: closeyou 时间: 2011-9-21 13:45

花の庆次发表于 2011-9-21 12:01
能透露点性能就可以了

工艺升一代，面积小一半，所以期待同等性能，功耗也能降一半。

作者: whhwhhwhh 时间: 2011-9-21 14:46
本帖最后由 whhwhhwhh 于 2011-9-21 14:46 编辑

closeyou 发表于 2011-9-21 13:45
工艺升一代，面积小一半，所以期待同等性能，功耗也能降一半。

可能性不大，不过LS的艺术照拍的不错呀。

作者: Viperknight 时间: 2011-9-21 15:21
没人吐槽这是semiaccurate的消息了么

作者: 粉蒸排骨 时间: 2011-9-21 15:32

Viperknight 发表于 2011-9-21 15:21
没人吐槽这是semiaccurate的消息了么

我正想说这个网站的消息有人信吗
信这个网站消息的一般都属于Pro-A

作者: goldman948 时间: 2011-9-21 15:35

Viperknight 发表于 2011-9-21 15:21
没人吐槽这是semiaccurate的消息了么

早就看到了....啥gk117一看就知道唬扯

作者: disruptor 时间: 2011-9-21 16:54
怎么看怎么像是n黑写的。低端芯片明年六月份才出的话nv还不去死？

作者: Cc. 时间: 2011-9-22 06:08

Viperknight 发表于 2011-9-21 15:21
没人吐槽这是semiaccurate的消息了么

E大明显笑而不语了

作者: SnakeLee 时间: 2011-9-22 08:42
各种烟雾弹啊，坐等A的下一代先出来领先一阵子好了，费米还是继续安逸的用着了

作者: kisslenovo 时间: 2011-9-22 16:00
等待啊

作者: bobcat 时间: 2011-9-25 02:18
本帖最后由 bobcat 于 2011-12-20 10:38 编辑

........

作者: fengpc 时间: 2011-9-25 22:41
RV1030还是老的VLIW4架构，再怎么早流片意义也不大了。再靠新工艺暴力堆流处理器的话AMD还是洗洗睡去吧

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