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Problems with A64 L2 cashe?

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December 28, 2003 5:04:30 PM

I was reading Tom's end of year price guide, and he mentioned something about the 3200 having a defect in its L2 cashe?

"1 MB of L2 cache makes up more than half of the almost 106 million transistors on the Athlon64. That means that at a realistic yield of 40-50%, more than one in two dies will have a transistor defect. Ideally, and provided they are in a disconnectable area within the L2 cache, these dies (with reparable defects) will simply produce an Athlon64 3000+.

In practice, the problems lie not only in the area of the L2 cache. However, AMD is in a position to use the process to offer a cheaper Athlon64 and to minimize rejects. A choice must be made in any case if the aim is to appeal to as many different customer segments with the products to match - the Mobile Athlon64 is another example."

Does this mean that the 1Mb cache on the 3200 has a risk of dropping to 512 due to a defect? I wasent too sure on that.

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December 28, 2003 5:15:31 PM

No;but if you're using it in 64 bits the effective cache will be 512.The amd64 3000+ are essentially defective 3200 which function at 512 cache in 32bit OS or as 206 cache in 64bit operating systems.
December 28, 2003 5:54:46 PM

Oh, I think I get it. the 3200 will run at 512 on a 32bit OS, and a 3000 will run lower then 512? Does that have a large effect on performance?

SO the specs they give is if they are being ran on a 64 bit OS? lot of good that does us...

(kislev01 is roommates username, I forgot to sign out)
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December 28, 2003 8:07:58 PM

What? Ignore the previous 2 replies please! Those two guys are obviously not very well informed.

What this article means is that during the manufacturing of the A64 3200+ some dies have some kind of defect that does not allow the use of the whole L2 cache, which is supposed to be 1MB. AMD knows if a die is good or not because every single one is tested. So, instead of throwing away the "bad" ones, the simply rebardge them as A64 3000+ making use only 512KBytes of L2 cache. So no, you don't have anything to worry about. If you buy an A64 3200+ then you will get 1MB L2 cache, period! This doesn't change whether you are running 32bit or 64bit software. Similarly, if you buy an A64 3000+ your CPU will only feature 512Kbytes of L2 cache. These are only "tricks" by companies in order to avoid unecessary waste of money.
December 28, 2003 9:03:05 PM

"No;but if you're using it in 64 bits the effective cache will be 512.The amd64 3000+ are essentially defective 3200 which function at 512 cache in 32bit OS or as 206 cache in 64bit operating systems."

Where the fXck did u get that from??? That's probly one of the most stupid things i've ever heard
December 29, 2003 12:40:10 AM

Ohhh, I see. Is the extra cache worth the extra money?
December 29, 2003 1:18:28 AM

Quote:
Ohhh, I see. Is the extra cache worth the extra money?

Depends on what you're doing with the CPU. In most cases it's good for only a few percent gain, so the 3200+ with full 1MB L2 cache is really more for bragging rights.

<i><Lionel Hutz> I'll be defending...The SCO Group!!!??? Even if I lose, I'll be famous!</i>
December 29, 2003 2:48:44 AM

thats what I wanted to know. thanks!
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