Intel's Core 2 Extreme & Core 2 Duo: The Empire Strikes Back
by Anand Lal Shimpi on July 14, 2006 12:00 AM EST- Posted in
- CPUs
L2 Cache: 4MB or 2MB?
The majority of Intel's Core 2 Duo line feature a single shared 4MB L2 cache, but the E6300 and E6400 are only equipped with a 2MB cache. Given that the Core 2 Duo doesn't have an on-die memory controller, it is more dependent on larger caches than AMD's Athlon 64 X2, which raises the question - how big of a difference is there between the 2MB L2 and 4MB L2 parts?
Our Core 2 Extreme X6800 (2.93GHz) part, like all X6800s, is unlocked so we could simulate any other Core 2 Duo clock speed with it. We managed to get our hands on a Core 2 Duo E6300 (1.86GHz/2MB) and we were in business.
The graph below features all of the benchmarks we ran on the processors in this review, showing the percent performance improvement from a Core 2 Duo E6300 (1.86GHz/2MB) to a hypothetical 1.86GHz Core 2 Duo with a 4MB L2 cache. The bar labeled "Average" is simply an average of all of the performance improvements graphed on the chart.
The 4MB L2 cache can increase performance by as much as 10% in some situations. Such a performance improvement is definitely tangible, and as applications grow larger in their working data sets then the advantage of a larger cache will only become more visible. Unfortunately, you do pay a price premium for this added performance and future proofing as the cheapest 4MB L2 part is the E6600 priced at $316.
If you're the type to upgrade often, then the extra cache is not worth it as you're not getting enough of a present day increase in performance to justify the added cost. However, if this processor will be the basis for your system for the next several years, we'd strongly recommend picking a 4MB flavor of Core 2.
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Gary Key - Friday, July 14, 2006 - link
The first nF4 Intel Edition boards will be available the week of 7/20. The nForce 500 boards for Intel will not be available until early August. We are now under NDA for the nForce 500 until NVIDIA makes their release announcement. However, there are a couple of nForce 500 boards that look very promising at this time. Do not expect high FSB overclocking results until NVIDIA's next chipset but overall performance is very good at this time.mobutu - Friday, July 14, 2006 - link
Thank you very much for the info you shared.Still, one more question: what do you mean "nVidia next chipset"? Like nF6 or smtg? Because if so it means probably Q4 2006 or Q1 2007 ...
Gary Key - Friday, July 14, 2006 - link
The one that will come out this winter that we cannot discuss except for the fact that it will be a single chip and dual x16 capable. :) Of course, no real mention of it so far but ATI has a really nice Intel chipset due in late August to early September followed up by a refresh in the winter also.mobutu - Friday, July 14, 2006 - link
Oh, I got it. Thank you very much, much appreciated.Looking forward to see Anandtech review of Conroe motherboards.
Visual - Friday, July 14, 2006 - link
you really need to include scores for 4ghz conroes, and maybe some 3.2ghz x2s(though this isnt really needed) and your review will be the most perfectest one evar!JarredWalton - Friday, July 14, 2006 - link
We generally reserve overclocking scores for articles specifically looking at that aspect. It's unfair to include OC'ed Core 2 without OC'ed X2, FX, etc. I hope to get a Core 2 in the near future to run some specific OC benchmarks comparing a lower end (E6300 and/or E6600) Core 2 with X2 3800+ (hopefully EE, but we'll see).junior1 - Saturday, July 15, 2006 - link
Jarred that would be great to see. The E6300 and X2 3800+ seem close, but the final AMD pricing and the overclocking potential of each could really make either the clear winner for performance per dollar in the midrange segment.
Is the die size smaller on E6300 and E6400, or is it a full die with half the cache disabled? Any chance the smaller cache means better OC potential?
It would be great to see results with several chipsets.
Warder45 - Friday, July 14, 2006 - link
awww. At least give us a taste, maybe 2 or 3 of the most CPU intensive tests run at 4ghz.Gary Key - Friday, July 14, 2006 - link
Just wait a few days.... :)mendocinosummit - Friday, July 14, 2006 - link
Ya, that is what I was hoping for. I want to see a dual core (that has some balls, unlike the preslers) run at 4ghz and do some benchmarks