P4T533 Bios Settings

[BadThad]

In the bios there's a memory option for the RAM, the choices are auto>3x>4x. What does this do? There's also a "Turbo" setting....anyone know what the specifically does? Is it stable?

...thanks!

 

[Toymaker]

Originally posted by: badthad
In the bios there's a memory option for the RAM, the choices are auto>3x>4x. What does this do? There's also a "Turbo" setting....anyone know what the specifically does? Is it stable?

...thanks!

The frequency of your RDRAM is a multiple of your CPU clock frequency times two. For instance: 133 Mhz CPU clock frequency at the 3x setting would be 133 X 3 = 399 X 2 = 798 or effectively 800 Mhz for your RDRAM frequency. The same 133 Mhz CPU clock at the 4x setting would come out to be 1064 Mhz or effectively 1066 Mhz. The auto setting simply automatically chooses your mutiple in order to achieve the best stability as pre-programmed into your bios. The 3x and 4x settings allow you to aggressively set your RDRAM frequency and therefore optimising it for the best performance according to the type and brand or quality of memory that you are using. Enabling turbo simply lowers the latency or access time to your memory. Turn it on or off it to provide the highest stable performance.

 

[BadThad]

Thanks!

OK, I have 2x256MB of Samsung PC1066...I should prob set it to 4x and Turbo for optimal performance, correct? This is the ram that Asus validated for this mobo.

I thought I read somewhere that the i850E didn't "officially" support rambus 1066, but that Asus built the capability into the P4T533. Is that true?

At POST, my system displays the Rambus Clock. That should show me 1066MHz, correct? I believe it is showing me half of that, at 145 fsb it was displaying 580MHz. Is this like DDR? The actual speed is 1160MHz?

Excuse my ignorance, I'm new to rambus world!

 

[GrumpyMan]

Put it at 4X with Turbo off intially. Turbo doesn't do much for you. I would set the fsb to 133 at first to make sure it boots fine and then start raising the fsb. You should get to around 140 to 150 fsb.

 

[BadThad]

Right now I'm at 1.6v (P4 2533), 146 fsb, 4x and no turbo.

I think I've answered some of my own questions, lol. The POST rambus speed is 1/2 of the actual speed.

Thanks