Re: Isn't Command Rate a "memory setting?"
- From: "DRS" <drs@xxxxxxxxxxx>
- Date: Thu, 4 May 2006 03:05:52 +1000
"milleron" <miller.90@xxxxxxxxx> wrote in message
news:1146671668.389336.70940@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
I'm having trouble with RAM again on my A8N-SLI Premium -- two sticks
of 512MB, 1GB total. I've already had Corsair replace my first set of
TwinX DIMMs, and all was well. However, after about four more months,
I started getting BSODs again and seeing errors in Prime95 AND in
Memtest86. If I set the command rate to 2T, then the computer's
stable at a CAS of 2.5. If I set the CAS to 3, then the computer's
stable at a command rate of 1T. CAS 2/1T and CAS 2.5/1T cause random
BSODs and errors in the memory-testing apps.
Some more detail would help. What voltage are you running your RAM at? The
spec for your memory says 2.75v. Are you overclocking anything? When I
overclocked my cpu I had to increase the core voltage to avoid errors in
Prime95. Etc.
Ram Guy on the Corsair forum, however, is telling me that Command Rate
is not a memory setting. In my BIOS the setting is under "DRAM
Configuration," and it's labeled "1T/2T Memory Timing," but this guy
is telling me that it's NOT a memory setting.
Arguably it isn't. It's a memory controller setting. When RAM Guy is
talking about memory settings he's talking about things that refer to
latency (ie, how fast the RAM responds to a command). The lower the Command
Rate the faster the memory controller can latch onto the command bus and
send commands out.
To his credit, he says
that if either stick, but not both, gives errors in Memtest86 at
2-2-2-5/1T, then he will classify that stick as bad and replace it.
That seems correct and fair, but he says that if both, installed
singly, give errors at 2-2-2-5/1T, then the problem is in the
motherboard or PSU, and I don't see how he can jump to that
conclusion. I don't see why that couldn't be from both DIMMs being
faulty.
They could both be faulty but I know that Corsair traditionally test sticks
indvidually at 1T so the probability is low. I don't know whether they use
1T or 2T when matching pairs for sale as TWINX. PSU problems are not out of
the question. 2-2-2-5-1T is about as aggressive as it gets, so if your RAM
voltage was fluctuating outside the spec then that could cause instability.
Not so long ago Tom's Hardware Guide did a massive PSU test and roughly a
third of the PSUs failed. Scary stuff. Or maybe you got a particular
motherboard that just happens not to be up to par. It's too hard to say at
this stage.
I paid a premium for XMS 3200XLPT that's rated at 2-2-2-5, but I
cannot run it that way (or even at 2.5-3-3-5) with a command rate of
1T. To me that's not up to spec, but Ram Guy says that as long as it
will run at their spec and 2T, the memory's OK. Doesn't this sound
bogus?
Do Corsair actually advertise this memory running paired at 2-2-2-5-1T?
.
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