Hypothetical c2d setups--which is faster

[3line]

Now, before anyone says that 500fsb is unfeasible with current motherboards, do keep in mind that this is a hypothetical scenario that I'm concoting to give me info about a future build. From the looks of things, RD600 and 985 mobos should be able to provide better fsb clocks.

1.86ghz allendale 7x multi @ 3600mhz (514 mhz fsb) / 1:1 fsb:memory, 1028mhz ddr2

2.4ghz conroe 9x multi @ 3600mhz (400 mhz fsb) / 3:4 fsb:memory, 1066mhz ddr2


Basically, the question boils down to whether it's worth it to run memory at a divider.

[Daleon]

Its probably a very small difference in performance. Anything you gain in running the memory faster you'll take a hit in not running it at 1:1. So if you don't have to run the memory faster, why bother.

[hUMANbEATbOX]

514 fsb is doable on the p5d-dlx and on the ds3, from what i've been seeing. i'm sure its a luck of the draw kind of thing.

you must also consider the cache diff between the e6300 and e6600. unless of course unless you were considering the e4300 due in 07. but that would be a 1.8ghz Allendale, 9x multi.

[3line]

What sort of performance hit do you take for not running your memory in 1:1?

[thegreek]

What sort of performance hit do you take for not running your memory in 1:1?
not much for you to notice

[DaveB]

Now, before anyone says that 500fsb is unfeasible with current motherboards, do keep in mind that this is a hypothetical scenario that I'm concoting to give me info about a future build. From the looks of things, RD600 and 985 mobos should be able to provide better fsb clocks.
Why would anyone say 500 MHz isn't feasible? I don't normally run this high, but here's a screenie of a successful PCMark05 run at an FSB of 523 MHz. This was done with cheap components, a retail E6300, a Gigabyte GA-965P-DS3, and Corsair Twin2X PC6400. Since there aren't any dividers in a 965P mobo, the DDR2 is also running at 523 MHz.

http://i6.tinypic.com/23wl0k8.jpg

[medicman45]

Umm DaveB that is amazing!!!!:eek:

Im getting the DS3 as a "filler" board with my E6700 til the RD600 comes out so yea. Even though they run better with Allendales this makes me happy.

[3line]

So how important is fsb for performance, then?

[Dragon Heart]

Now, before anyone says that 500fsb is unfeasible with current motherboards, do keep in mind that this is a hypothetical scenario that I'm concoting to give me info about a future build. From the looks of things, RD600 and 985 mobos should be able to provide better fsb clocks.

1.86ghz allendale 7x multi @ 3600mhz (514 mhz fsb) / 1:1 fsb:memory, 1028mhz ddr2

2.4ghz conroe 9x multi @ 3600mhz (400 mhz fsb) / 3:4 fsb:memory, 1066mhz ddr2


Basically, the question boils down to whether it's worth it to run memory at a divider.

I think the 2nd choice is the best

Don't forget that raising fsb needs to overvolt NB and you really need good cooling, assuming you keep air cooling .Depends if you want stability or benching too....

Allendale is slower than conroe for benching tests ( ie superpi 1M ) because of its lower L2 , but difference otherwise is very little.

Big issues actually with c2D is bootstrap and how ram is managed .

[batboy]

Generally, if you can get an equal top speed with both systems, the performance winner would be the one with significantly higher FSB (assuming all else is equal).

[Dragon Heart]

Generally, if you can get an equal top speed with both systems, the performance winner would be the one with significantly higher FSB (assuming all else is equal).
I do agree , I was just considering a 24/7 stable rig with reasonable cooling :)

[Actually running orthos for 9h @cpu 53 °]

[Evilsizer]

as batboy said the one with the higher fsb is going to be faster, just about 5%-10% depending on the app your using.

[Daleon]

Wow, thats one of the best E6300 OC's I've seen so far. I'm guessing 3.4 is your 24/7 stable speed? Niiiiiice. I can tell the performance differences between 3.2-3.6 is pretty slim though.

[Evilsizer]

Wow, thats one of the best E6300 OC's I've seen so far. I'm guessing 3.4 is your 24/7 stable speed? Niiiiiice. I can tell the performance differences between 3.2-3.6 is pretty slim though.
yea 3.2-3.6ghz is going to come down to what you are doing and wiether the app can take advantage of the extra speed.