?? Interpret Memtest86+ After Upgrade ??

[tlbaxter]

Hi all,

I just upgraded my memory from 1GB of PC-5300 to 8GB of PC-6400 and I was hoping someone might be able to explain some Memtest86+ results. My specific question is about the MHz reported on the third line of output shown below but any other comments are appreciated, of course.

With 1GB of PC-5300 installed, here is what Memtest86+ reported:

Memory  : 895M   1665 MB/s
Chipset : AMD K8 (ECC : Disabled)
Settings: RAM : 351 MHz (DDR703) / CAS : 5-5-5-15 / DDR-2 (64 bits)

Notice the 351 MHz on the third line, above.

With 8GB of PC-6400 installed, here is what Memtest86+ reported:

Memory  : 8063M   2681 MB/s
Chipset : AMD K8 (ECC : Disabled)
Settings: RAM : 401 MHz (DDR803) / CAS : 6-6-6-18 / DDR-2 (128 bits)

In comparing the first line of output from each test, I'm glad to see the PC-6400 memory is faster (1665 MB/s vs. 2681 MB/s). I believe (please correct me) this is the transfer rate from memory to...the L1 or L2 or CPU. I'm not exactly sure.

The third lines have me more confused. PC-5300 is supposed to run at 667 MHz while PC-6400 should run at 800 MHz. Are the third lines of output telling me the PC-5300 is only running at 351 MHz while the PC-6400 is only running at 401 MHz? If so, why would this be? Is my interpretation wrong?

Thanks

 

[chookman]

You should be reading the bracketed figure... in the second case your DDR-800mhz is running at 803... which seems fine, i cant explain why the 667 is running at 703 though seems a bit high.

And i think ... the transfer rate is to the CPU. But im not sure.

 

[Mondoman]

memtest86+ is reporting both the clock rate (401MHz) and the actual datarate (DDR2-803). "DDR" stands for "double data rate" which means that two chunks of data are transferred per clock cycle.
You may find this post helpful as well: http://www.tomshardware.com/forum/200599-30-memory-nooob-aarrggghh-timings#t1249881