Intel Core i7 720QM with 8mb of L3 cache?

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July 3, 2010 at 14:17:25
Specs: Windows 7
I just recently bought an Asus n61jq-x1 laptop with an Intel Core i7 720QM processor and I noticed something odd recently. When I used the program Astra32 to get a better in depth look at my hardware, the thing that stood out odd was that Astra32 showed 8mb of L3 cache instead of 6mb of L3 cache like the intel spec sheet showed on its website. If these chips do indeed have 8mb of L3 cache, like Astra32 recognizes it to have, than i'm wondering what's the reason for Intel disabling 2mb of L3 cache on these chips. The only two reasons I can come up with behind the 2mb of L3 cache being disabled, is that either the 2mb of L3 cache is defective or just simply turned off to fill in the price/performance gap.

Iron Sharpens Iron.


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#1
July 4, 2010 at 00:30:27
it is common for system specs software to report wrong information. If i were u i will try different softwares. For cpu info i trust cpuz.
edit: core i7 8200m start wich 8mb l3 cache. It is possible i7 7200m is i7 8200m with reduced speed & l3 cache.

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#2
July 4, 2010 at 17:27:00
I've used this software on diff systems and it has been spot on with their hardware specs. Cpuz won't recognize stuff that is disabled it only reads what's there or enabled. I also used Astra32 on processors in the past like the Phenom II x3 720 for example and it reads four cores even though 3 are active. So it seems to me that the 720QM does indeed have 8mb of L3 cache, but 2mb of L3 cache are disable.

Iron Sharpens Iron.


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#3
July 4, 2010 at 21:24:40
"So it seems to me that the 720QM does indeed have 8mb of L3 cache, but 2mb of L3 cache are disable. "

That's probably what's happening. Intel will probably release a true 6MB part later on. IIRC, when the mobile C2Ds were first released, the T5500 and T5600 processors had 4MB of cache, half of which was disabled. Then a few months later, Intel made Merom-2M versions of the T5000 processors.

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#4
July 4, 2010 at 23:05:06
I figured it was something of that nature.

Too bad there isn't a way to unlock the 2mb L3 cache that is disabled like you can with Advanced Clock Calibration on certain AMD motherboards.

Iron Sharpens Iron.


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