RDRAM Turbo Mode?

[Gregory_WE]

Option in my BIOS... I've had it enabled and disabled and I haven't noticed any difference between the two. Anyone know what exactly it does (or is supposed to do)?

[cerberus]

i havent seen any diff in on.off either.. benchmarks are the same.. dunno what the hell it is either

[Gregory_WE]

Still wondering :)

[Gregory_WE]

:\

[seamadan000]

is there a 3X and 4X option in your bios too......

If there is not it could be that, but you would definately notice a difference in benchmarks if it were that

well, I just don't know
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[Gregory_WE]

Nope it's not that, there is a 3X/4X setting.

[FIZZ3]

It should make a difference... I haven't tested it myself, but maybe it would take a few sandra mem runs to filter out the error. If that is so, the difference is very small in any case.

[Gregory_WE]

I've tested on and off... every time I score between 3360-3380 on memory bandwidth.

[FIZZ3]

Originally posted by Gregory_WE
I've tested on and off... every time I score between 3360-3380 on memory bandwidth.

It may be a comforting thought for people trying to get their overclock stable that it doesn't seem to matter for performance. I did read about several people having to turn it off for stability's sake.

[Gregory_WE]

hmm, well it COULD kick in when overclocking, but I doubt it... haven't really tested it when overclocked. I don't really run my system overclocked much except for benchmarking.

[strangeBrew]

According to asus... Turbo mode is supposed to speed up the delay time in turn speeding up memory.

[frostmeister]

Rojakpot (http://www.rojakpot.com) tells you all these strange and wonderfull bios settings and what they're likely to do from an overclocking point of view. The turbo mode may be the "spread spectrum" ram option by the sounds of it, which in turbo mode would keep the ram frequency at a set frequency, rather than varying it. "This option can reduce EMI" according to the bios on my board and rojakpot...

[Caffinehog]

It probably decreases latency. bandwidth will be the same, but there will be less delay between data requests.

[frostmeister]

Bandwidth, latency and transfer rate are linked, but three different things; Bandwidth is measured in Hz, transfer rate in bytes per second, and latency in seconds - or billionths of a second - nanoseconds - in memory terms. So, say you have a latency of 2 nanoseconds, and you transfer a byte of data every two nanoseconds, your transfer rate is 2GB per second. Calculating the bandwidth is a different matter, as two transfers occur every clock cycle, one on the leading edge, one on the falling edge, hence DDR, or double data rate. Transfer rates are based on how much data you can move on each clock cycle therefore, and bandwidth is a physical limitation of the silicon, or how fast these transfers can happen. That's why increasing the number of data paths that data can flow out on, i.e. going from 128 to 256 bit transfers in the case of recent video cards, increases data transfer by transferring twice as much data each clock cycle, but not increasing the bandwidth, as the memory still operates at say, 2.8ns in the case of a radeon 9700 pro (I think it's 2.8ns anyway, correct me if I'm wrong) So for 2.8ns, a max clock speed is 357Mhz, or effectively, 714Mhz if it's DDR. Hope this explains a bit more :)