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| Welcome to Windows Vista Forums. Our forum is dedicated to helping you find solutions with any problems, errors or issues you are experiencing with Windows Vista. The Vista forum also covers news and updates and has an extensive Windows Vista tutorial section that covers a wide range of tips and tricks. |
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07-05-2007
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| Administrator | CPU L2 Cache Memory setting in Vista How to Set Vista for the CPU L2 Cache Memory Size |
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07-26-2008
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| Member | Re: CPU L2 Cache Memory setting in Vista Thanks for the reply Shawn. I tried that method and it works like it should. Great site by the way. Im a total noob when it comes to vista and for me this site is a blessing. |
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07-26-2008
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| Administrator | Re: CPU L2 Cache Memory setting in Vista Your welcome AboveSecret. Shawn |
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08-09-2008
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| Newbie | Re: CPU L2 Cache Memory setting in Vista Sorry if this is a stupid question  what do you put if it is dual cpu? I have a dell precision 490 with 2x3ghz dual cores with each processor having 4mb cache (2048 KB per core) |
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08-10-2008
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| Administrator | Re: CPU L2 Cache Memory setting in Vista Hi Flazza, and welcome to Vista Forums. For the Dual-Core Intel® Xeon® 5160 3.0GHz, 1333 FSB, 4MB L2 Cache, 80 watts processor you would use 4MB (4096) since it's L2 memory is shared. http://www.intel.com/business/enterp...Xeon_Brief.pdf Quote: Dual-Core Intel® Xeon® Processor 5100 Series 4M shared cache fully accessible by each core lowering memory latency and increasing performanceHope this helps, Shawn |
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08-15-2008
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| Banned | Re: CPU L2 Cache Memory setting in Vista I've been testing this tweak, and it seems to work so far. I have a Core 2 Duo E6600 with 4MB of cache, which means each core has access to 2MB of cache each. |
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08-15-2008
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| Administrator | Re: CPU L2 Cache Memory setting in Vista Hi WildEagle, Actually, looking up your CPUs specs, it shares the 4MB L2 cache with both cores. You can set it for the full 4MB.  This PDF document from Intel shows you the specifications for all Core 2 Duo processors. http://download.intel.com/products/p...prod_brief.pdf |
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08-15-2008
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| Banned | Re: CPU L2 Cache Memory setting in Vista That's what I did was set it for 4MB's of cache. The cache being shared between the 2 cores simply means that each core has access to 2MB of cache each. |
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08-15-2008
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| System 'ministrator | Re: CPU L2 Cache Memory setting in Vista  Quote: Originally Posted by WildEagle  That's what I did was set it for 4MB's of cache. The cache being shared between the 2 cores simply means that each core has access to 2MB of cache each. |
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08-15-2008
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| System 'ministrator | Re: CPU L2 Cache Memory setting in Vista It's worth re-quoting Microsoft on this registry value. Detailed Explanation of SecondLevelDataCache Quote: SecondLevelDataCache records the size of the processor cache, also known as the secondary or L2 cache. If the value of this entry is 0, the system attempts to retrieve the L2 cache size from the Hardware Abstraction Layer (HAL) for the platform. If it fails, it uses a default L2 cache size of 256 KB. If the value of this entry is not 0, it uses this value as the L2 cache size. This entry is designed as a secondary source of cache size information for computers on which the HAL cannot detect the L2 cache. This is not related to the hardware; it is only useful for computers with direct-mapped L2 caches. Pentium II and later processors do not have direct- mapped L2 caches. SecondLevelDataCache can increase performance by approximately 2 percent in certain cases for older computers with ample memory (more than 64 MB) by scattering physical pages better in the address space so there are not so many L2 cache collisions. Setting SecondLevelDataCache to 256 KB rather than 2 MB (when the computer has a 2 MB L2 cache) would probably have about a 0.4 percent performance penalty. According to a little time with google, it appears that neither Intel or AMD has produced a mainstream processor with a direct-mapped L2 cache for several processor generations. This really is an old legacy key, and can be safely left at 0. Altering it should not harm your computer - but neither will you gain anything from it. For more information, check out the wikipedia entry. |
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08-15-2008
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| Banned | Re: CPU L2 Cache Memory setting in Vista Quote: Originally Posted by ltwally Incorrect. On Core2Duo's, the cache is shared wholey by both cores. Therefore, each core sees an entire 4meg of cache - NOT 2meg of cache. Take a look at videocards like the 3870X2 which I own, it comes with 1GB of shared videomemory, but each chip only has access to 512MB of video memory at one time. This is how dual core cpu's and videocards such as the 3870X2 operate, there is no way, that if they operated any other way, they would get anything done. |
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