1:1 Memory Ratio

[ragedriven]

hey so i'm new to overclocking:

default settings are
c2d e6700 @ 266mhz x10 = 2.66ghz
evga 680i
266 * 4 =1066 mhz FSB
memory at 1:1 default? = 266 x 2 = DDR2 533

i have 2gb of DDR2 800 RAM, so at default its actually at 533?

so.... i've reached 3.7 ghz oc (370 x 10) @ 1.55Volt vcore
370 x 4 = 1480 FSB @ 1.4Volt
stable under p95 for ~20 min. til i stop it.
the ram at a 4:5 ratio is at 925 mhz @ 2.0Volt (doable for my corsaire twin2x2048 with the LED lights i think)
(370 * 1.25 * 2 = 925 mhz)

Question:
would i get better TOTAL GAMING performance if i
raise FSB to 400 and lower multiplier to 9x for a 3.6 ghz clock and have a 1:1 800mhz ram? with obviously lover vcore volts?

is my vcore too high? its with in recommended tollerances i think, i get 42° idle 55° load.

 

[keskejesuis]

That's correct for 533 Mhz

3.6 Ghz with low vcore, seems difficult to reach those heights. Depends also of your cpu... Every cpu has different overclocking potentials. With my E6400, I can reach 3 Ghz with 1.25 V, but 3.4 Ghz or more need 1.4 V.

1:1 will give you the best bandwidth (533 Mhz) but will give a lot of stress on the northbridge with very high FSB. I had to make a choice : put a hudge fan straight on the northbridge or lower the FSB... Guess what's my choice...

4:5 is a good compromise (means DDR @ 667).

42° C idle is fuction of your room temp. If you get 42° at 25 ° ambient, that's correct. If ambient is actually 19 °, I can't imagine what will happen at 30 ° ! 😉 55 ° C at load is acceptable (given max temp of 61 - 65°)

By curiosity, are you using stock intel cooler ?

 

[ARM]

What nobody seems to have mentioned is DUAL CHANNEL.

I'm assuming that you have 2 stick of 1 gig, because 2 gig is rare.

Thus you probably have your RAM in dual channel configuration (if not you are a n00b).

This means that DDR2 533, DOES, in fact, run at 1066mhz!

266*2*2=266*4=1066mhz.

Or have I somehow got this wrong?

It would be quite frustrating that none of you knew this if I am right.

 

[Guest]

You are right but the point is that the ram does run at 533 matching the CPU bandwith in dual channel.

It does not run at this speed though, it run at a actual 266 like in your formula

 

[Testgamma1]

If you set the RAM at 800 and then overclock the FSB to 333 your RAM will be running much higher than 800. Memory Speed = FSB x Ratio X 2.

Some BIOS lists the actual ratios for RAM speed, my DS3 for instance has a choice of AUTO, 2 (which is really the 1:1, because after the x2 for double data rate the ration becomes 2:1), some mother motherboards list memory speed instead of a ratio but it's really a ratio... confusing? absolutely. If you set the memory to 800, its only really at 800 at the stock FSB settings.

That said, you can try running the FSB at 333 and the leaving the ratio at something higher than 1:1 (or 533) and see if it's stable. If it is, it's not going to hurt anything. But, you'd probably see better performance at the same processor speeds by going 400 on the FSB and lowering the multiplier to 7 or 8.

sir i cant understand this,

what do you mean that the memory= fsb x ratio x 2?

flyinformula said that he will try to set his fsb to 800 and his ram frequency at 800 right?

you said that the memory will run higher than 800,

i cant understand how the 800 will go much higher than 800 sir,..

can you please help me about these
T_T,...

thx..

 

[roush2fast]

dude look at the dates.


This sure is happening a lot lately.

 

[Testgamma1]

im fine man^_^

i totally understand memory ratio ^_^ tnx..