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.
Facebook
Twitter
RSS
202 Comments
View All Comments
soydios - Friday, July 14, 2006 - link
Awesome article, as always from AT. Between the article and the 100+ comments above this one, almost all my Conroe questions have been answered.;)
johnsonx - Friday, July 14, 2006 - link
Wow is all I can say. I don't think there's ever been a performance jump quite like this. AMD will still do ok (not win mind you) on the low-end, where most people live, but the mid-range and high-end is so overwhelmingly in Intel's camp now there's just no comparison. AMD would have to go to 3.4Ghz+ to even be competitive (and still not win mind you).My office computers will continue to be AMD Sempron for the forseeable future (AM2 from now on of course), but next time someone wants a CAD box I don't see how I can quote anything but Core 2 Duo.
Also, loved the dinner table analogy on page 13.
crimson117 - Friday, July 14, 2006 - link
http://www.tgdaily.com/2006/07/13/dell_xps700_to_f...">http://www.tgdaily.com/2006/07/13/dell_xps700_to_f..."Grapevine (TX) - On the day Intel announces its next generation of Conroe desktop processors - which is expected within days - Dell Computer will upgrade its top-of-the-line XPS 700 desktop computer model to offer not only an overclocked Core 2 Extreme CPU, but also the option of two Nvidia GeForce 7900 GTX cards in SLI mode. These will apparently replace the Pentium Extreme processor and GeForce 7900 GS options currently available, and will be in addition to the Aegia PhysX accelerator already offered."
epsilonparadox - Friday, July 14, 2006 - link
Probably an Nf4 chipset since there are motherboards with conroe support using Nf4.Avalon - Friday, July 14, 2006 - link
This is one fine architecture. It wound up performing as well as I had suspected it would. Definitely wow.cgrecu77 - Friday, July 14, 2006 - link
I gambled by purchasing a A64 3700+ a few weeks ago when it dropped to under 150 ...If I were to upgrade to the cheapest solo I would probably have to pay 500 dollars or more (new cpu, mb and memory) and I will probably get ~ performance in games. I stopped overclokcing a long time ago (except for maybe 10%) because I am tired of my new system becoming unstable after 4 months (plus I don't really need it anymore since nothing I do is really cpu limited).
98% of people actually buy the cheapest CPUs in a range (A64 2800-3200, x2 3800, C6300). That's where the real competition will be and frankly I'm not impressed at all, A64 is an ~3years old processor and intel's newest product can only beat it by 20%? As far as I can remember the Athlon 3200+ was even worse in comparison to P4 3,2 Ghz and most people still bought the 2500+ Bartons ... So I wouldn't worry too much if I were an AMD stock holder, especially that it looks like Opterons still have no competition in the multi cpu servers (more than 2 ...).
After all, if Dell decided to use AMD NOW of all times it must mean something, they probably had access to these benchmarks a little earlier than Anand had ... :)
One thing I would have expected to see for such a new CPU that is supposed to carry the Intel flag for the next 2 years is 64 bit performance. This is probably the last year when 32bit OSes have the upper hand, starting with Vista most people will take advantage of their 64bit cpus. Once the majors concentrate on 64 bit drivers you can be sure that they will gradually take resource from the 32 bit development and the balance will shift very quickly ... If A64 has even a 10% advantage over the Cores combined with the .65 switch it will probably balance the equation to the point where core and a64 will have similar performance per clock ...
dargaard - Saturday, July 15, 2006 - link
http://babelfish.altavista.com/babelfish/trurl_pag...">Some Conroe problems (??) with 64 bitdev0lution - Friday, July 14, 2006 - link
First off, why mention Core Solo when it's totally unrelated to this article and any of the comments?
Second, socket 939's days are already numbered. You'd have to pay the same $500 to upgrade to the AM2 processors benched in the article, so mentioning this as a diss to Core 2 Duo is pretty weak.
So you'd have the option of spending $500 to upgrade to a E6600 setup that would beat out a $1200+ AM2 setup. Sounds like a no-brainer. And if you think AMD's going to slash prices below Intel's parts I don't think you can hold your breath that long.
And 98% of people don't even build their own computers, they buy tier-1... who aren't making nearly that percentage of their systems with the lowest end parts.
Looks like I'll have a 3200, 3700 and 4000 (939 parts) for sale in the near future...
MrKaz - Monday, July 17, 2006 - link
OK.But if you dont want to spent more than 120$ for the processor, the Conroe looks expensive.
aznskickass - Friday, July 14, 2006 - link
Dude, 20% is a HUGE margin when you are talking competitive benchmarks.When A64 was released back in 2003 it had about a 10% edge on the P4 and people were lauding it for it's leap in performance, and rightly so, considering the AXPs were getting beaten by 10%, so it was a 20% turnaround altogether.
This time around, it's even more impressive from Intel as they have turned a 10 - 20% performance deficit into a 20% advantage, you really can't expect much more than that, can you?
What did you expect Intel to do, double A64 performance? I'm sure if they ran their chips @ 4GHz/400FSB they might be able to get close to that, but what is the point when you have beaten your competition so convincingly already?