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dothan chip? means 2 mb L cache right

post #1 of 11
10/28/04 at 10:15am
Thread Starter 
am bout ready to order my 3790 but is a 1.7 p m chip a dothan if it has a 2 mb L cache? looking at the 3790 C but want a dothan, thx Bill
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post #2 of 11
10/28/04 at 10:23am
The Sager 3790 does indeed have the Dothan core processor with 2MB L2 cache.
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post #3 of 11
10/28/04 at 10:47am
Here's the rest of them http://www.intel.com/products/processor_number/info.htm
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post #4 of 11
10/28/04 at 12:23pm
and what is the use of the 2mb L2 cache???
I am totally clueless, sorry!
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post #5 of 11
10/28/04 at 1:19pm
Stores machine language opcodes so they don't have to be reloaded. Cache memory can be loaded thousands of times faster than any read/write operation from system memory. This doesn't really help with parallel processing(multithreading) though, which is why some people are concerned about not having hyperthreading in the Dothan and Banias chips.

Wouldn't multi-processor laptops be cool? I've yet to see any of those.
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post #6 of 11
10/29/04 at 2:32am
Is it true that Windows disabled the cache?
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post #7 of 11
10/29/04 at 2:38am
Quote:
Originally Posted by Schmohey
Is it true that Windows disabled the cache?
Where did you read that? I would be interested in reading about this.
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post #8 of 11
10/29/04 at 3:00am
Quote:
Originally Posted by Schmohey
Is it true that Windows disabled the cache?
Windows disabling cache? I heard that windows can't DETECT how much L2 cache your cpu has. So if you want to you go gotta input it yourself into the registry.
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post #9 of 11
10/29/04 at 8:44pm
Quote:
Originally Posted by j5fakt0r
Windows disabling cache? I heard that windows can't DETECT how much L2 cache your cpu has. So if you want to you go gotta input it yourself into the registry.
Yeah, that's what I mean. What do you input into the registry? Can you input more than what you have?
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post #10 of 11
10/29/04 at 11:31pm
Registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

Look for a DWORD value called SecondLevelDataCache

This will by default be set to zero, which is equivalent to 256KB L2 cache

If you want to manually modify this, you can enter the size of your CPU's L2 in KB, e.g. 2048 for a new Dothan chip, BUT MAKE SURE YOU SELECT DECIMAL for the Base setting! (Or, alternately, fire up calc, enter scientific mode, and convert your CPU's L2 cache size in KB to hexadecimal).

There is no point to entering more than what you have. If anything this will cause problems. In fact it's not encouraged to even edit this setting at all, typically; I believe newer versions of Windows (2000, XP) "auto-tune" this parameter anyway.

***DISCLAIMER*** edit your Registry at your own risk. Not responsible for typos, system damage, etc. from mistaken/incorrect Registry edits.

I have made this edit on several older systems I have owned (triple-checking myself as always in the Registry) without ill effects. I have not done it under XP.
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post #11 of 11
10/30/04 at 5:30am
I wanna confirm pelazem. I have done this under winXP pro. No problem at all. In fact, I dind't have to change it. It was already detected at 1024mb for me. with service pack 2 winxp pro
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