What's "memory auto precharge" ?

Suma · Oct 10, 2003

I looked in the bios of my new 8rda+ 2.1 and in the Chipset Features there's "memory auto precharge", I didn't have that in my 1.1, what does it do? should I put it on Disabled or Enabled? (for OC settings).

thx.
Suma

K_King · Oct 17, 2003

I'd like to know also

Suma · Oct 17, 2003

Quote from epox usa bios section: "Add "Auto_Precharge_Selectable" option to patch some DDR unstable issue. (i.e. A-DATA DDR400 / TwinMOS DDR 400)"

Still I can't really understand what does it do?

Gnufsh · Oct 18, 2003

THe PRECHARGE command is used to deactivate an open row. After PRECHARGE is issued and after the tRP delay, the row will again be ready for access. I believe autoprecharge does this automatically, which isn't necessarily a good thing. Many boards don't enable it because they assume that you will want data near the data that you just requested, and it
may be faser not to deactivate the row right away.

Suma · Oct 18, 2003

So is it better enabled or disabled?
From what you wrote I understand Disabled is better correct me if I'm wrong.

Speed_Mechanic2 · Oct 18, 2003

The best way is always to benchmark/stress test both settings and see what it gets you.

Gnufsh · Oct 18, 2003

It really depends on the code you're trying to speed up. Does it have it's memory in one block and use a lot of bandwidth, or does it scatter things around?

Suma · Oct 18, 2003

Man, I use lots of stuff.
I will just do what Speed_Mechanic2 suggested.

What's "memory auto precharge" ?

Suma

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K_King

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Suma

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Gnufsh

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Suma

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Speed_Mechanic2

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Gnufsh

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Suma

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