need help.. very weird thing happening

[Eagled]

hey all,

so.. I am into overclocking myself.. and I have already met a few troubles

so I got my toledo to 2.6ghz, prime stable for an hour, ran aquamark etc.. I don't want to go any further on the cpu.

My ram can do up to 219mhz 2.5-3-3-8.

I keep ldt multiplier to auto

the problem is.. that

if I use 11 cpu multiplier, fsb 237 and mem divider 180/200 I get

CPU = 2607mhz

RAM = 200.6mhz

I get 6240 sandra mem bandwidth and about 99.500 aquamark 3 score...

 

now, what I did is use 10 cpu multiplier, fsb 261 and mem divider 166/200

CPU = 2610mhz

RAM = 217.2mhz

I get the same sandra mem bandwidth!!! still 6240 or something v close to that.

aquamark score is still around 99.500

 

 

I don't understand... in the second case my ram is running 217mhz.. while first case 200mhz

 

Why don't I see a performance increase?

I keep the same memory timings in both cases

 

 

 

Before u ask.. My psu is Tagan 480W, good psu 28A @ +12v rail, and I got all power connectors plugged on the mobo.

[THunDA]

Do you have all your timings on auto in bios.. ?

 

My guess is when your running the faster mem speed some timings that are on auto are automatically loosening up because the ram is running faster..

 

edit..

Do a google for a64 Tweaker if you dont have it and open it up with both configs and compare the timings

[Eagled]

thx for the reply..

I will do as you say..

Although, I have my doubts.. as I am getting the exact same memory bandwidth in both cases..

[Eagled]

ok I did it..

most of the timings are the same... only thing that changes is the divider(which I change it), max async latency from 7ns to 8ns and read preamble time from 6ns to 6.5ns.

 

I also tested

219 fsb 219 X 11 = 2409mhz cpu and 219 ram(synchronous), mem bandwidth = around 6000

 

237 fsb 237 X 11 =2607mhz cpu and ram 180/200 divider, ram around 200

mem bandwidht = 6200

 

wtf?

 

Also... is it my idea or do all X2 dual core athlons have some penalty in mem bandwidth?? At stock I get around 5500mb/s.. my old winnie would do 5900mb/s

 

Now, I know mem bandwidth isn't important.. but I am just curious