DDR2 RAM - How Fast is it Going?

Hi,

I've built my first PC.  I am wondering if my RAM is operating at its optimum speed.

Mo/bo Asus M2N-SLI Deluxe with BIOS ver. 1604
AMD Athlon 64 X2 3800+
WD SATA II 200 GB & 500 GB drives
EVGA nVidia GeForce 7600 GS with 256 MB
Windows XPP SP3
Wintec  AMPO 1GB (2 x 512MB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model 3AMD2800-1G1K-R

How do I see what the RAM is rated?  Should I expect to see it rated at 800 MHz?

ub
RobertAsked:
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dbruntonConnect With a Mentor Commented:
400 MHz is correct.

See here http://en.wikipedia.org/wiki/DDR2_SDRAM for the specifications.
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RobertAuthor Commented:
I'veinstalled PC Wizard from CPUID.com.

The RAM shows up correctly as 1024 MB, and shows the two as 512 MB [Type] DDR2-800 PC2-6400 (399 MHz).

More detail from PC Wizard -
Supported Frequencies :      399 MHz, 400 MHz
CAS Latency (tCL) :      4 clocks @399 MHz, 5 clocks @400 MHz
RAS to CAS (tRCD) :      5 clocks @399 MHz, 5 clocks @400 MHz
RAS Precharge (tRP) :      5 clocks @399 MHz, 5 clocks @400 MHz
Cycle Time (tRAS) :      18 clocks @399 MHz, 18 clocks @400 MHz
Min TRC :      23 clocks @399 MHz, 23 clocks @400 MHz
   
So it seems like it's running at 400 MHz, not 800 MHz.

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_Connect With a Mentor Commented:
Correct. DDR stands for Double Date Rate
400MHz is the base bus speed, time 2 gets you 800MHz

There is a chart about half way down:
http://en.wikipedia.org/wiki/DDR2_SDRAM
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_Commented:
I'm going to start refreshing before I post.   ; )
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RobertAuthor Commented:
Great - I thought that might be the case - but guessing is a good way to screw things up!
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_Commented:
Thank you much.   : )
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