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Question about Sandy Bridge binning

post #1 of 7
Thread Starter 
Does any of you know how Intel makes the current Sandy Bridge desktop CPU's ?

Back in the Core 2 Duo / Quad era it was easy to know, for example, that a Core 2 Quad Q9650 was basically two Core 2 Duos E8400's, a Q9400 was two E7300's with a higher FSB, etc, but now I can't find out information about how Intel makes their Sandy Bridge CPU's.

These are my doubts:

1. The Core i5 2500 and 2600 have HD2000 graphics and the k versions have HD3000 graphics.

So, are the chips identical from a CPU die perspective, with the non k versions having half the GPU fused off, or are they really different chips ?


2. The Core i5 2xxx and the Core i7 2xxxx are different in the sense the 2600 and 2600k have Hyperthreading and two more megabytes of cache.

Same question as above: does the i5 2xxx family have Hyperthreading on die, but disabled (I would figure yes), and more importantly, does it have 2MB of cache fused off ?

This last question is quite intriguing because, speaking in a parallel sense, they have already announced future chips with 10 and 15 MB of cache, which brings the question, they are all different parts or is there some binning being done with certain models, and which ?
 
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post #2 of 7
All sandy bridge i5s and i7s are the same dies with just certain parts disabled(Hyperthreding,Cache,etc).

I am not sure about future models, but if I guessed they will be completely different, since future sandy bridges will be on socket 2011, and Ivy bridge is considered a different architecture.
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Bartonn;13956317 
All sandy bridge i5s and i7s are the same dies with just certain parts disabled(Hyperthreding,Cache,etc).

I am not sure about future models, but if I guessed they will be completely different, since future sandy bridges will be on socket 2011, and Ivy bridge is considered a different architecture.

You're right about future models, those I mentioned with 10 and 15Mb of cache (and also 12MB) will indeed be on socket 2011, I forgot about that. But it still raises the same question.

But do you know of any source that says that current Sandy Bridge CPU's are indeed the same chip, with parts fused off ?

It's just that I have a hard time believing that Intel is fusing off 2MB of cache from every non Core i7 2600 / 2600k CPU they sell. That would be just a waste of die space and I honestly don't believe their yields are bad, quite the contrary, they are quite good, so they wouldn't need to do it in the first place.
 
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post #4 of 7
Quote:
Originally Posted by tpi2007;13956382 
It's just that I have a hard time believing that Intel is fusing off 2MB of cache from every non Core i7 2600 / 2600k CPU they sell. That would be just a waste of die space and I honestly don't beleive their yields are bad, quite the contrary, they are quite good.
Its all about the benjamins.
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post #5 of 7
Quote:
Originally Posted by amstech;13956393 
Its all about the benjamins.

Yeah, this is the same thing that AMD does with their dual core and triple core Phenoms (except AMD uses software and Intel likes to permanently disable stuff). Most of the time the chip is perfectly fine until they zap it...
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post #6 of 7
Can't find the original source, but I am almost positive that they are the same chip.

As to why they would do it, look at amd's phenoms. They sell dual, triple, and quad core chips that are all based on the same chip with different cores disabled. many of these cores are functional, but they do it to offer different price points and separate the golden chips from the crappier ones.
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post #7 of 7
I imagine the cache in most 2500k works fine, intel just wants more money.

As for binning, I bet that 2600k come from the heart of the silicon. Thats seems the be the biggest factor in getting a good chip.
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