fsb:ram 4:5

[Baboeuf]

i found out that my fsb:ram ratio is 4:5 set by the manufacture. isn´t that a bad ratio? i think best is 5:5!? or is there any benefit for a ratio of 4:5? would be great to know! thx!

[Smurfboy]

1:1 is the best, i believe its called synchronos mode.

[Baboeuf]

thx. i´m going to change it!

[Baboeuf]

i tried to change the ratio but couldn´t find where! in bios there is a "dram frequency" where i can choose "auto", "133MHZ (DDR266)" or "166 MHZ (DDR333)". can somebody help pls?

[jason4207]

Specs please.

4:5 isn't bad if it works. Usually it's good to stay 1:1 for testing so you don't have your RAM speed getting in the way of your CPU OC.

[Baboeuf]

Specs please.
what else do you want to know? as i wrote in an other thread: i´m new to the whole oc-thing!

4:5 isn't bad if it works. Usually it's good to stay 1:1 for testing so you don't have your RAM speed getting in the way of your CPU OC.
i have my cpu oc to 160FSB and i have a DDR400. so i think i could set it to 1:1 or oc it!? what would you prefere normally?

[Albuquerque]

Well, wait a minute... Did you really mean to type 160FSB? I ask because the last time Intel had FSB's that low was back when the Willamette and Northwood (aka, original Pentium 4) cores were around.

Your Pentium D805 started with a FSB of 266, and I have to assume you've gone higher than that. So... What's your real FSB?

Once we know that, we can help you with the ratio options.

[Baboeuf]

Well, wait a minute... Did you really mean to type 160FSB? I ask because the last time Intel had FSB's that low was back when the Willamette and Northwood (aka, original Pentium 4) cores were around.

Your Pentium D805 started with a FSB of 266, and I have to assume you've gone higher than that. So... What's your real FSB?

Once we know that, we can help you with the ratio options.

it started with FSB133. i think it is based on the pentium4 technology (don´t know, just think i heard that anywhere).

could it be that there is a lock for the ratio so that i can´t change it!? i cann´t find anything like that in the BIOS!!!!

[Albuquerque]

I didn't think the Pentium-D's were such low FSB parts, but a bit of Googling has proven me wrong. Yikes.

So here's the answers you're looking for. The "133Mhz" mode is 1:1, it will run your memory at 320Mhz. The "166Mhz" mode is 4:5, it will run your memory at 400Mhz. So leave it on the "166Mhz" mode if you want to use the full speed of your memory.

In reality, it won't much matter either way. Memory running faster than FSB speed results in near-zero real-world performance increase. There are tons of benchmarks online showing 100% increases in memory speed resulting in 2% or less actual performance gain in anything other than very specific synthetic benchmarks.

Anything below 1:1 is performance detrimental, but anything above 1:1 is typically just more power wasted and more heat generated for essentially no performance gained.

[DocClock aka MadClocker]

Intel branded boards usualy have little or no overclocking tweeks...just the nature of the beast.
I believe that your chip is a Prescott, which has nown heat issues...make sure you have good cooling on that chip, and you'll be fine.
If you can afford it, I would get a different board, like Asus, MSI, Gigabyte,Abit, etc.

[Albuquerque]

Where did you see he had an Intel board? It says ASROCK 775 right there in his sig. Not saying they're a whole lot better, but it obviously allows overclocking.

And while they're still Netburst cores, the 8xx and 9xx series did run cooler than the original Presc"hot" 5xx, 6xx and 7xx series processors.

[Baboeuf]

I didn't think the Pentium-D's were such low FSB parts, but a bit of Googling has proven me wrong. Yikes.

So here's the answers you're looking for. The "133Mhz" mode is 1:1, it will run your memory at 320Mhz. The "166Mhz" mode is 4:5, it will run your memory at 400Mhz. So leave it on the "166Mhz" mode if you want to use the full speed of your memory.

In reality, it won't much matter either way. Memory running faster than FSB speed results in near-zero real-world performance increase. There are tons of benchmarks online showing 100% increases in memory speed resulting in 2% or less actual performance gain in anything other than very specific synthetic benchmarks.

Anything below 1:1 is performance detrimental, but anything above 1:1 is typically just more power wasted and more heat generated for essentially no performance gained.

thx for searching! i´m going to get a zalman 9700 LED. i hope it will be here on monday than i will change the settings and oc the cpu a little more! i hope it will work! thx again!

but one question: i thought with 400 MHZ memory i could oc the cpu more than with 320 MHZ memory!?

[Oc1Kenube]

400mhz memory will allow you to overclock your FSB to 200mhz

So if FSB = 200mhz - then memory speed is FSB x2 which = Memory speed.

This calcultaion is true for all 1;1 ratio calculations using DDR ram