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Memory slowed down


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#1 90awdturbo

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Posted 21 March 2010 - 09:57 PM

I recently added 2 more sticks of ram to my computer raising the total from 4gigs to 8. When testing my memory bandwidth with Sandra afterwords it had dropped from 7.9GBs to 6.4GBs. When I took the 2 new sticks out and left the 2 original in and reran Sandra it was still 6.4GBs? Also when I look at the memory total in System settings it says 8GB(3.25 usable). Anyone have an idea why this happened?
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#2 Broni

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Posted 21 March 2010 - 11:35 PM

it says 8GB(3.25 usable)

I assume, it's 32-bit system?
If so, you wasted your money, buying anything over 4GB.

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#3 Platypus

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Posted 22 March 2010 - 02:52 AM

To add to Broni's comment, if you want to have full access to 8GB of memory, you'll have to install a 64-bit operating system.

As for the performance issue, it's hard to say, but the memory controller on some motherboards doesn't have sufficient current drive to operate a full memory complement at full speed, and will slow down. It may be that the configuration data is not being updated when the extra memory is removed. Some BIOS have an option to force an update, maybe called "Reset Configuration Data", or "Force ESCD Update". If you find this in the BIOS setup options, enabling it may restore the original memory speed.

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#4 90awdturbo

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Posted 22 March 2010 - 02:43 PM

I'll check out the BIOS for that option, thank you. I'm running x64 Windows7 Ultimate so the 4gig restriction shouldn't apply. Any other ideas?
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#5 Platypus

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Posted 22 March 2010 - 05:02 PM

A lot of people report their 64-bit OS not accessing full memory complement until the Memory Remap option is enabled in the BIOS.

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#6 hamluis

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Posted 23 March 2010 - 11:56 AM

<<When I took the 2 new sticks out and left the 2 original in and reran Sandra it was still 6.4GBs>>

I'd say that SSS is unreliable, in that case.

Louis




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