AMD overclocker, please look

[Corporate Thug]

have u guys ever tried using the mem:fsb ration and running the two out of sync? like running the mem@200Mhz and running the FSB @ 250 using the 4:5 ratio? is there any REAL advantage to this rather than running is in sync @ 200 mhz?

 

[paladiin]

An article I read on Anandtech's review of the nForce2 showed benchmarks for a synched setup beats an unsynched setup. For example, the 166/166 performed better than 166/200.

While they didn't test 250/200, I would have to guess that running it out of sync will result in lower performance. Would be nice to see though - there has to be some point where the out of sync passes the synched settings.

 

[Chumpman]

I too have thought about this, but as paladiin said, I doubt it would result in any performance increase. If you need more speed on the chip, you can always just increase the multiplier.

 

[Jeff7]

There will be a threshold at some point, but it can depend on a lot - processor speed, RAM speed, timings....
Example - running a 1GHz FSB (hypothetical) and 200MHz RAM will be a lot faster than synced 200FSB. The threshold can likely be best found through lots of rebooting and benchmarks.

 

[lobadobadingdong]

ahh, but having higher mem bandwith than your fsb creates a faster system...

with my ddr333 and 1700+ @266 fsb is 15-20 min. faster at seti WU's than when running the mem at 266 with lower latency.

 

[Jeff7181]

I ran my FSB at 221 and my RAM at 166 with a 75% divider when all I had was PC2700 RAM that wouldn't overclock at all. It was perfectly stable, and definately fast enough... benchmarks only suffered a little because of the reduced bandwidth, but not much.

 

[jjyiz28]

Originally posted by: shady06
have u guys ever tried using the mem:fsb ration and running the two out of sync? like running the mem@200Mhz and running the FSB @ 250 using the 4:5 ratio? is there any REAL advantage to this rather than running is in sync @ 200 mhz?

no, max out your fsb as much as you can, and then max out your memory bandwidth, as long as it doesn't exceed your fsb. if it doesn't so be it, since you raised your fsb to your max. if you fsb craps out on you before your memory, run it in sync.

running your fsb/memory in sync is a good thing, but it shouldn't dictate on how much you want to up your fsb, you should up ur fsb much as possible.