P5B deluxe FSB 401-460?

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um, ok so the new BIOS will allow for FSB1333, but what does this mean for FSB set between 401-460? apparently 400FSB will provide 500mb/s MORE bandwidth than 401...
 
i was reading this thread:
http://www.short-media.com/forum/showthread.php?t=50712

and notice point 8 under the unresolved issues section

is it true that FSB between 401-460 will give you slower performance than 400? has this issue been fixed with the newer bios releases yet?
Click to expand...

The problem has to do with chipset straps. The straps are 266-333-400-467and 533 the bandwidth ramps up and down in between these settings and is most noticeable in the 401 to 460ish range.
The decrease in memory bandwidth affects overall performance
The 1333 bios upgrade is for CPU support.
The chipset strap is already in place.
 
If you can hit 430 to 450 fsb the drop is only memory bandwidth and you can compensate with good ddr2 800 cas4 ram.
The CPU performance still climbs respectfully.
The best performance of course is right at the straps.
Depending on your CPU find the combination that is best suited for the multiplier.

In answer to your question 400 is the best bandwidth and anything higher you need a little more skill and a very good cooling solution.
When you start hitting 500 FSB your Voltages NB, Memory, Vcore all need to increase to stabilize the system and this is not as easy as it sounds.
Very achievable but to maintain this OC you need to open your wallet :lol:
My suggestion is as long as you’re stable and within the thermal limits hit whatever your overclock permits :wink:
 
hmm i see

well ive been trying out multipliers and finding the maximum overclock and this is what i can hit...

394 x9 ... 3.54ghz

435 x8 ... 3.52ghz

465 x7 ... 3.25ghz

theyre the absolutely highest i can go, all running 1:1 ratio, on this setup:

c2d e6600
p5b deluxe
2gb corsair xms2 pc2-6400C4
tuniq tower 120
corsair 620W

which of those combinations do you think gives me best overall performance?
 
In my experience no matter the speed, the higher the Multiplyer (x) the better atleast in synthetic benchmarks (thats why we pay more for 6600's compared to a 6300), also you should be able to get much more out of your OC.

I also have a p5b and e6600 but with kingston value ram ddr2-667, and i have had it upwards of 450 x 9
 
Keep the 9X multiplier and stay within 333 or the 400 FSB straps for 1:1
When you lower the multiplier the additional increase in the FSB will not give you an increase in performance.
At the base frequency with the stock multiplier (lets use your 9X) the chipset is at its optimum latency.
When you drop the multiplier and raise the FSB the higher frequency forces you to raise the Northbridge volts to compensate. You actually loose ground
Some people say the latency changes (loosens) and they may be right.
The 9 X multiplier gives you a higher frequency base that requires less increase in fsb and in your case a better chance of maintaining 3.6GHz
 
but doesnt increasing the fsb give me better memory performance at 1:1 as youre increase the memory frequency as well that way?

I also have a p5b and e6600 but with kingston value ram ddr2-667, and i have had it upwards of 450 x 9
Click to expand...

wow, what voltages are you using? at a 9 multiplier my computer wont even run stable at 400fsb 8O
 
lol so i dont get it, how does running a 7 multiplier with a 465 frequency not improve performance? because my memory is running faster that way

or are you saying the overall clock speed is more important than having a high clock and memory frequency?
 
lol so i dont get it, how does running a 7 multiplier with a 465 frequency not improve performance? because my memory is running faster that way

or are you saying the overall clock speed is more important than having a high clock and memory frequency?
Click to expand...

Youre overthinking :lol:
If your at ddr2 800 at 3.6 Ghz you can loosen the latency and increase the memory to DDR2 1000.
Theres your boost.
at the lower multiplier your chipset is doing all the work or front side bus if you may.
Let the cpu strut its stuff with the 9X multiplier and finish off the overclock with an increase in ram frequncy or lower timings
 
Correct me if I'm wrong but Dual channel only works up to DDR2-800 on that board.
Click to expand...
this board will do well over 1200Mhz :wink:

In dual channel mode? man did I have some wrong info :?

I think I'm in love with the P5B Deluxe by the way... :? :twisted:
 
Sorry it took so long
lost a hard drive :cry:
3.6 Ghz 400 fsb E6600 X9 multiplier
DDR 1000 speeds


DDR 800 speeds 3.6 Ghz 400 fsb E6600 X9 multiplier




3960 MHz ddr 1100 440fsb E6600 X 9 multiplier



DDR 1200
 
i was reading this thread:
http://www.short-media.com/forum/showthread.php?t=50712

and notice point 8 under the unresolved issues section

is it true that FSB between 401-460 will give you slower performance than 400? has this issue been fixed with the newer bios releases yet?
Click to expand...
I remember when I was OCing a CPU a while ago, I noticed that certain lower FSB OCs, would cause the PC to crash, where'as a slightly higher one would run perfectly :)

Someone gave a reason for this in a post.

I forget what it was now 😳
 
Hmm, so according the first and second pictures running asynchronously at DDR2-1000 speed does yield a boost (over DDR2-800) in performance even if a small one. And it definitely runs in dual channel over DDR2-800. Very good to know, thanks for the shots 8)
 
lol so i dont get it, how does running a 7 multiplier with a 465 frequency not improve performance? because my memory is running faster that way

or are you saying the overall clock speed is more important than having a high clock and memory frequency?
Click to expand...

I’ve run a few tests on your theory that the higher FSB with the lower multiplier could give you better performance.
As you can see below this is just not the case and with an inferior CPU with less level 2 cache and an even lower multiplier the performance can drop is even more noticeably.
You might say the increase in performance at 9X is minimal in comparison but over longer periods of time in number crunching or DVD encoding the higher multiplier would dominate the lower multiplier.
And that’s what it’s all about.


E6600 460FSB 8X multiplier.
The memory bandwidth has dropped over the 9X multiplier settings

CPU performance has little or no gain at 3600 MHz over stock 9 X multiplier

E6600 at 400 FSB 9x multiplier has the higher memory bandwidth and better CPU performance than the 8 X multiplier


470 FSB 8X multiplier 3760 MHz


418 FSB 9X multiplier 3760 MHz

With the 9X multiplier the memory bandwidth has dropped slightly because of the strap change but CPU performance gains slightly.

So in conclusion there is little benefit to increased FSB speeds.
You can even loose ground trying to hurtle the walls and stay within the chipset straps.
Even though 3760 is possible on air these tests were done with water cooling and in no way should be attempted without proper cooling, and Testing for stability staying within reasonable thermal guidelines.
There I added my disclaimer 8)
 
Excellent info Kwalker. As I'll be overclocking an E6600 as soon as I return from this deployment I find the more settings and info posted a wealth of information for me.

Thanks!
 
thanks for that, looks like ill stick with 9x multiplier then

i cant quite hit 400FSB with it though, how far away from 400 should I be before I start to notice big drops in memory bandwidth?
 
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