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View Full Version : AMD: Ditching more cache for less, since 2006


Das Capitolin
07-01-2006, 09:07 AM
DailyTech has managed to get a hold of an AMD engineering chip labeled "Athlon 64 X2 3600+ for AM2." According to CPU-Z, the processor is a 2.0GHz CPU, the same as the Athlon 64 Windsor 3800+. However, half of the L2 cache has been disabled effectively making this AMD's first dual-core processor with a total of 512KB of L2 cache.

AMD recently discontinued all of its 2x1MB L2 cache processors less than two weeks after the processors were announced. This may be an indicator that low-bin Athlon 64 X2 processors will instead transition to 2x256KB cache configurations, instead of the 2x512KB parts that were previously the low-bin. However, since the CPU is only an engineering sample, it’s not easy to determine if AMD will even publically announce the CPU, or if it will simply become an OEM-only component for high quantity system builders like the original Socket 939 Semprons.

CPU-Z shows the Athlon 64 X2 3600+ to still sport the Windsor CPU core, the same CPU core that was used for the 2x1MB and is still used for the 2x512KB AM2 processors.

HKEPC has also come across the 3600+, claiming it will ship in Q4'06 for a price of $139 to $159. Given that AMD is expected to announce major CPU price cuts near the end of July, the $139 price tag fits in with the rest of AMD's pricing. Intel's lowest-bin Conroe, the 1.86GHz Core 2 Duo processor, is expected to ship with a price of around $183. In contrast, the 3.0GHz Presler NetBurst processor is expected to hover around $133 at the same time HKEPC claims the X2 3600+ may ship.

Cited: http://www.dailytech.com/article.aspx?newsid=3099

Price cuts aside, I can't see the benefit in doing this. Less is more? :confused:

Kougar
07-01-2006, 10:00 AM
Well, I posted my thoughts on this development here: http://www.bjorn3d.com/forum/showthread.php?t=8735&highlight=3600 (http://www.bjorn3d.com/forum/showthread.php?t=8735&highlight=3600)

AMD is doing this to try and undercut the lowest priced Conroe (E6300 $183), and secondly if it works they can afford to produce more of these, since with the smaller cache it only needs less die size to produce. Every inch on that 300mm silicon wafer real estate costs a good amount to use, however it IS used...

Intel has AMD in an arm lock right now for quite a few reasons, but they all basically add up to AMD being unable to produce as many chips off the same 200mm and 300mm wafers AMD uses. Less cache means more CPUs, and also less defective CPUs at the same time...

werty316
07-01-2006, 07:08 PM
I think this is a good move since the larger cache really doesn't improve performance in a big amount and the price isn't worth it.

Bio-Hazard
07-01-2006, 07:34 PM
Less cash out put means more in the bank, and face it, the main stream user hasn't a clue and could care less if a CPU has 256, 512 or a meg of cache. And that's who this CPU is aimed at (OEM). And if they get more OEM's to use the chip, that generates more sales and increases the market share even more for AMD. That's what's it's all about in the end, the chips that we use (gamers/overclocks) play and extremely small part in the overall picture when it comes to the bottom line.

Das Capitolin
07-01-2006, 09:48 PM
So apparenty less cache (less cost) equals lower product cost, and therefore a higher sales ratio. Sad that we sacrifice performance and technology just to boost sales. Just like the auto industry.

werty316
07-01-2006, 10:05 PM
Not a huge amount a performance and most likley only noticable in benchmarks. More users would buy the cheaper chip but as for OEM rigs like sbrehm said they could batch OEM rigs with the more expensive chips and the buyer is none the wiser.

Kougar
07-01-2006, 10:08 PM
It's true halving the cache from 1mb to 512kb only affected a few applications, and usually to a small degree... However halving the cache again will definitely cause some large performance hits. Unless the program in question is multithreaded, the X2 3600+'s performance will only be on par with a single 2ghz Sempron processor.

I'll agree completely with you on your points, Sbrehm. Joe user wouldn't have a clue, will buy the cheapest model regardless of what's in it, and the end result is AMD saved a good slice of expenses selling the guy a X2 3600 instead of a X2 3800...

werty316
07-01-2006, 10:11 PM
The future will be multi thread so single cores are on the bring of its last life; after all Intel Kentsfield quadcores are coming sooner than most would expect.

Das Capitolin
07-01-2006, 11:17 PM
The future will be multi thread so single cores are on the bring of its last life; after all Intel Kentsfield quadcores are coming sooner than most would expect.

Very soon, in fact. But as I recall, they will have 8Mb of RAM on cache.

GIBSON
07-04-2006, 10:00 PM
i for one do think slicing away half of the cache will have a performance hit

werty316
07-04-2006, 10:23 PM
i for one do think slicing away half of the cache will have a performance hit

Its does but its not an overly huge amount.