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running memory asynch

W

Wigwam

Senior member
I would be grateful for insight into the following:

I was having trouble overclocking my machine to 200MHz fsb. I then tested with memtest running cpu at stock speed [133MHZ fsb] and RAM at 200MHz.
I got lots of errors and contacted the retailer with my results. They tell me that running with the RAM frequency higher than cpu frequency will cause errors.
Is this true or are trying to weasle out of an RMA? [To be fair they did say that if down the line i get a 200MHZ fsb cpu and ram is faulty they will extend warranty to cover it]

I know you can run asynchronous ram, [though in synch is better] so what is the truth?
 
They're lying to you. RAM should run at it's advertised speed if your board supports it irrespective of what speed your CPU is running at.

Set your motherboard to configure the RAM by SPD (in the BIOS) and then do memtest again, if the SPD is correct then your RAM should run at it's top speed no matter what FSB your CPU is running at.

There is a school of thought that running RAM asynchronously is slower (even if running the RAM at a higher FSB) than running them synchronously, which I happen to agree with after doing my own tests, but this doesn't change the fact that your RAM should run pefectly well at it's advertised speed.

I would get onto your supplier and demand they RMA it if I were you

Mnementh
 
would you believe it wasnt my ram after all? infact it is a dodgey dimm slot 1!!!!

after i ram 11-3-3-3 at 2.8v and still got loads of errors and i decided to test 1 dimm at a time; luckily i mistook slot 3 for slot 1 and tested both dimms in slot 3 at spd ie 8-3-3-2.5 at 2.6v; no errors in memtest in 5 passes

i then tested in slot 1 and loads of errors in tests 5 and 6 [what i was getting all along]
then slot 2 - 1 error with 1 dimm in test 6 in 10 passes.

so now running dual channel slots 2/3. [after overnight memtest like this i will put it back down to 166 and run synch]

so....slot 1 works fine upto 166mhz but gives errors at 200mhz. is this a cause for alarm? i am not sure if this is worthy of an rma.....
 
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