Only half of the cpu's L2 cache detected?

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ZachC

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Apr 4, 2015
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I recently was given an Acer Aspire m3900. Performance was awful So I popped in a Xeon E5450 (12mb of cache).
During post the bios said that it only detected 6144 kb.

Why is the bios not detecting the full 12mb of cache?

specs:
Xeon e5450
GTX 1050 ti
250 gb ssd
G45T/G43T-am3 v1.1 motherboard
6gb ddr3
 
Solution
Ecky
That makes sense. 775 (and 771) CPUs were not single-die quad cores, they were actually a pair of dual cores stitched together on a single chip. Seeing 2x6MB is what you'd expect.
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Carbongrip

Carbongrip

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Dec 21, 2015
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There are multiple levels of cache, L1, L2, L3. Are you sure you were looking at the right one? Intel ARK says the 12mb cache on that CPU is L2 cache.

Edit:
How is this CPU even working in that board, I looked up that motherboard and it appears to be a LGA 775 socket. The Xeon E5450 you say you have is reported by Intel ARK as being an LGA 771 CPU.
 
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ZachC

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Apr 4, 2015
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Forgot to mention I did the LGA 771 to 775 mod. Heres a picture of the post screen where it says 64kb of L1 and 6mb of L2.
ywvEDH.jpg
 
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Carbongrip

Carbongrip

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Oh that's right I almost forgot about that mod where you use the tape to cover the unused pads. Um... I wonder if what your seeing is a product of the BIOS not officially supporting such a chip.

Try this...
If you have Windows 8 or higher you can open task manager and see what it reports the L2 cache as being.
 
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ZachC

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Unfortunately, I have Win 7. Do you know of a program that reports the l2 cache.
I was hoping that the motherboard would not be the problem, or at least have a work around (Even if I end up destroying the board).
 
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Carbongrip

Carbongrip

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Oh boy, time to start thinking about upgrading to Windows 10, you missed the free upgrades. Anyways you can download a program called CPU-Z that will show everything CPU related including the Cache.

Here is a link...
http://www.cpuid.com/softwares/cpu-z.html

If the system is stable then I don't think I would worry about the incorrect Cache report in BIOS. If you want to stress the CPU in a benchmark I would use a program called Cinebench R15.

Here is a link...
https://www.maxon.net/en/products/cinebench/
 
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ZachC

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Apr 4, 2015
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Oh no not Windows 10. I have installed it 4 times on my main PC, that crap crashes two to three times a day (windows 7 rarely crashed on same setup)!

Anyways, CPU-Z reports the L2 cache as 6144x2, but it would be nice to see if it is actually using it rather than just reading the info from the cpu, and get better performance.

I'm thinking about getting a p45 board so that I can overclock the Xeon.
 
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