In most motherboards, numerous settings can be found to optimize your memory. These settings are often found the Advanced Chipset section of the popular award bioses. In certain instances, the settings maybe placed in odd locations, so please consult your motherboard manual for specific information. Below are common latency options:
Command rate - is the delay (in clock cycles) between when chip select is asserted (i.e. the RAM is selected) and commands (i.e. Activate Row) can be issued to the RAM. Typical values are 1T (one clock cycle) and 2T (two clock cycles).

CAS (Column Address Strobe or Column Address Select) - is the number of clock cycles (or Ticks, denoted with T) between the issuance of the READ command and when the data arrives at the data bus. Memory can be visualized as a table of cell locations and the CAS delay is invoked every time the column changes, which is more often than row changing.

tRP (RAS Precharge Delay) - is the speed or length of time that it takes DRAM to terminate one row access and start another. In simpler terms, it means switching memory banks.

tRCD (RAS (Row Access Strobe) to CAS delay) - As it says it's the time between RAS and CAS access, ie. the delay between when a memory bank is activated to when a read/write command is sent to that bank. Picture an Excel spreadsheet with a number across the top and along the left side. They numbers down the left side represent the Rows and the numbers across the top represent the Columns. The time it would take you, for example, to move down to Row 20 and across to Column 20 is RAS to CAS.

tRAS (Active to Precharge or Active Precharge Delay) - controls the length of the delay between the activation and precharge commands ---- basically how long after activation can the access cycle be started again. This influences row activation time which is taken into account when memory has hit the last column in a specific row, or when an entirely different memory location is requested.
These timings or delays occur in a particular order. When a Row of memory is activated to be read by the memory controller, there is a delay before the data on that Row is ready to be accessed, this is known as tRCD (RAS to CAS, or Row Address Strobe to Column Access Strobe delay). Once the contents of the row have been activated, a read command is sent, again by the memory controller, and the delay before it starts actually reading is the CAS (Column Access Strobe) latency. When reading is complete, the Row of data must be de-activated, which requires another delay, known as tRP (RAS Precharge), before another Row can be activated. The final value is tRAS, which occurs whenever the controller has to address different rows in a RAM chip. Once a row is activated, it cannot be de-activated until the delay of tRAS is over.

hi guys, i have a trouble booting up my PC after trying to mod the timing from 2.5, 3, 3, 6 to 2.5, 2, 2, 6

now it just show me big black blank screen... 
how do i tell the mobo to reset?

take out CMOS battery or dunno what jumper thingy?
please help ..... i lost my lovely desktop ...

The question is, i can use ATI Tool to set my graphic card heatsink fan to run at maximum speed 24/7, this is my question, is there any software that i can use to set my graphic card heatsink fan to run at maximum speed just like what ATI Tool did for my X1800XL?

Can i use ATI Tool for that purpose?

Help me...

ouhh kay. can you help us understand what you just said?

1. i can use ATI Tool to set my graphic card heatsink fan to run at maximum speed 24/7,
2. is there any software that i can use to set my graphic card heatsink fan to run at maximum speed just like what ATI Tool did for my X1800XL

erm........me confused.

And right now, i've changed my X1800XL to Nvidia 7900GT, my question is, is there any software that can do the job like the ATI tool?

What i meant is, is there any software that can be used to control the fan speed on my stock heatsink fan for my 7900GT?

tu la, you change to 7900GT but you didn't say mah. your siggy also not updated......still MSI ATI Radeon X1800XL Crossfire :: Arctic Cooling Accelero X2

now you understand why confusing?

anyway, have you tried nVidia Control Panel? it allows you to set 2D / 3D mode fan speed.

I'm trying to understand the control panel, but there's too many tabs, and i can't find it, where does it stated?

erm. yeah that darn panel very confusing. keep a look out for Adjust GPU Setting. you might have to click Change Display Configuration or whater first.

i donno about the SLI part.

Can't find it...
Before this, i've used a 7600GT before, IINM, even the overclocking menu can be easily found, but right now after i've switched to 7900GT, it's nowhere to be found...

Anyone can help me by giving a screenshot on where should i find that thing?

hehe. i face same problem with you. my previous interface and current interface like different

mine's using Forceware 91.31 and Control Panel 1.2.1.32

BTW goldfries, the CP u mean is the new nvidia 1, why got different version? The new CP is so confusing for me too  , I still using the old CP (can choose) btw