Re: Isn't Command Rate a "memory setting?"
- From: nospam@xxxxxxxxxx (Paul)
- Date: Fri, 05 May 2006 17:35:10 GMT
In article <4q1m521qdndhbqj6tok4gl7p06ss76i7mn@xxxxxxx>, nah... they
wouldn't would they ? wrote:
I kinda wonder about all this timing stuff. I've got a 754
cpu that runs two double sided ram sticks at 1T command rate
and the rated DDR400 speeds. Even have the sticks spaced
apart (slots 1 and 3) for extra cooling.
I'm using an older bios that predates AMD's mandate to
motherboard manufacturer's to cripple the 754 memory systems
in the bios.
Frankly I think 754 probably performs near as well as 939
and they had to cripple it to make their marketing fly.
Anyone ever seen a review that clocks the hypertransport bus
the same for both 754 and 939 and adjusts the cpu speeds to
match ?
If anyone wants to override certain BIOS settings, there
are always programs like A64tweaker and Clockgen. With
Clockgen, you can change clock settings. A64tweaker is
for memory timings. Between the two of them, you should be
able to get what you want. (Mind you, I don't have an
Athlon64, and this is based on what I've read.)
One thing I don't believe you can change "on the fly", is
the CAS setting, but that should be perfectly programmable
by way of the BIOS. The CAS setting is passed to the memory
chips by means of a special cycle, when the memory DIMMs
are going through their initialization sequence, early in the
BIOS POST. Once the value is programmed, I don't know if
it can be changed while the system is operating or not.
And the AMD documentation I have collected here, doesn't
address the issue. (Intel chipset docs mention a register
that puts the memory controller in special modes, and I
cannot find the equivalent function in AMD's 26094 doc.)
If you put your mind to it, you can change a lot of stuff.
Here is an article comparing S754 to S939.
http://www.behardware.com/articles/531-6/testing-12-athlon-64s.html
Paul
.
- References:
- Isn't Command Rate a "memory setting?"
- From: milleron
- Re: Isn't Command Rate a "memory setting?"
- From: John Lewis
- Re: Isn't Command Rate a "memory setting?"
- From: milleron
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- From: John Lewis
- Re: Isn't Command Rate a "memory setting?"
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