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Should FSB speed = RAM speed?
jonno4130 
4/9/08 3:38:32 PM
Serf
Hi guys, planning my first venture into the world of overclocking and have been reading up on guides and walk throughs left right and centre before i do. so i was wondering about the relationship between the FSB and the RAM... My apologies in advance, im a beginner, so bare with me...

Short Version:
Is it better to have the FSB and the RAM running at equal speeds, or does it work better if one is faster than the other?

Long Version:
I have an e8500 that runs at 3.16ghz and has a FSB of 1333. Now the FSB gets divded by four, so that leaves me with an FSB of 333 and a multi of 9.5.

I plan/hope to hit 4ghz, which means a FSB of 425 with the 9.5 multi.

My RAM runs at 1066mhz. Since it is double data rate, that means 533mhz.

So, that leaves three possible outcomes for my next three questions.

1. Should the divided values be equal to one another? If so, since the FSB is only at 425 does that extra 108mhz the RAM has do anything? would i be better underclocking the RAM to equal the FSB (therefore 2 x 425 = RAM @ 850mhz) so i can tighten the timings etc?

2. Or should the end values be equal to one another? so that the 1066mhz RAM should be overclocked to try and get closer to the new 1700mhz FSB?

3. Or the RAM speed and the FSB speed have no relationship and i am a space cadet?

again apologies, ive been trying to use my google-fu to read up on it but cant find an answer...

Cheers

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c0nc0n 
4/9/08 7:36:58 PM
Champion

Well, I'm in a similar situation dude..

Don't worry about trying to get EXACTLY 1066 speeds on your RAM... It'll be difficult if you're trying to get to 4Ghz as dividers won't allow for that unless you have an nVidia based mobo which allows unlinked overclocking - that is, you can overclock your FSB and keep your RAM at a certain speed. That's useful if you have shitty ram... But that's not the case with you or me..

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E8500 (RIP Q9450) + Gigabyte EP45-DS3R + 4GB DDR2-1000 4-4-4-10 1T Ballistix Tracers + Gigabyte HD4850 512mb + X-Fi XtremeMusic w/ Razer Lycosa & Lachesis.
http://i203.photobucket.com/albums/aa256/c0nc0n3m0/lol.gif

tantryl 
4/9/08 7:38:40 PM
SuperHero
Immortal


Just pop the RAM on the x2.50 "divider".

So long as the RAM FSB is equal to or above the real CPU FSB (not the quad pumped FSB) you're fine. Core 2 architecture won't get a lot of benefit from running the RAM a little bit faster, but since the RAM can do it you might as well.

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"It is the war we cannot win, nor can we lose nor drop. There is evidence of an instability of ideas, a floating series of judgements, our policy of nervous conciliation which is very disturbing."
- US Senator Hugh Scott

c0nc0n 
4/9/08 7:56:07 PM
Champion

2.4B is the one tantryl is talking about by the way..

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E8500 (RIP Q9450) + Gigabyte EP45-DS3R + 4GB DDR2-1000 4-4-4-10 1T Ballistix Tracers + Gigabyte HD4850 512mb + X-Fi XtremeMusic w/ Razer Lycosa & Lachesis.
http://i203.photobucket.com/albums/aa256/c0nc0n3m0/lol.gif

tantryl 
5/9/08 9:51:42 AM
SuperHero
Immortal


Nope, I was talking about the x2.50 "divider" on Gigabyte/Intel mainboards.

425MHz FSB, x2.5 = 1062.5MHz

Don't need to overclock the RAM, get the most out of it.

-----
"It is the war we cannot win, nor can we lose nor drop. There is evidence of an instability of ideas, a floating series of judgements, our policy of nervous conciliation which is very disturbing."
- US Senator Hugh Scott

c0nc0n 
5/9/08 11:42:25 AM
Champion

There isn't a 2.5x divider on the new Gigabyte boards, or as far as I can tell with my knowledge, I get like 2.0x (x represents either A,B, C or D depending on FSB Strap), 2.4x, 3.3x and 4.0x.

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E8500 (RIP Q9450) + Gigabyte EP45-DS3R + 4GB DDR2-1000 4-4-4-10 1T Ballistix Tracers + Gigabyte HD4850 512mb + X-Fi XtremeMusic w/ Razer Lycosa & Lachesis.
http://i203.photobucket.com/albums/aa256/c0nc0n3m0/lol.gif

tantryl 
5/9/08 1:50:23 PM
SuperHero
Immortal


Interesting.

I can't imagine why they'd remove that option but there it is.

-----
"It is the war we cannot win, nor can we lose nor drop. There is evidence of an instability of ideas, a floating series of judgements, our policy of nervous conciliation which is very disturbing."
- US Senator Hugh Scott

Fat_Bodybuilder 
7/9/08 7:24:33 AM
Titan

Quote by tantryl
Just pop the RAM on the x2.50 "divider".

So long as the RAM FSB is equal to or above the real CPU FSB (not the quad pumped FSB) you're fine.



Hey I was just wondering, since I don't use a mainboard that uses ratios, can you set the ram speed 'lower' than the FSB?

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E8500 @ 4.0Ghz Daily || 2GB OCZ Special Ops || X38-DS4 || HD 4870   
ViewSonic 26" || Logitech Z4 || TJ07 || G11 and G5

c0nc0n 
7/9/08 3:23:16 PM
Champion

Update: After updating to F9 BIOS, I have 2.5A multi (So it's 200mhz FSB strap)

Quote by Fat_Bodybuilder
Quote by tantryl
Just pop the RAM on the x2.50 "divider".

So long as the RAM FSB is equal to or above the real CPU FSB (not the quad pumped FSB) you're fine.



Hey I was just wondering, since I don't use a mainboard that uses ratios, can you set the ram speed 'lower' than the FSB?



Well, theoretically we are using ratios, but it's hidden behind numbers.


Edited by c0nc0n: 7/9/2008 3:24:08 PM

-----
E8500 (RIP Q9450) + Gigabyte EP45-DS3R + 4GB DDR2-1000 4-4-4-10 1T Ballistix Tracers + Gigabyte HD4850 512mb + X-Fi XtremeMusic w/ Razer Lycosa & Lachesis.
http://i203.photobucket.com/albums/aa256/c0nc0n3m0/lol.gif

Fat_Bodybuilder 
7/9/08 3:31:52 PM
Titan

Quote by c0nc0n
Update: After updating to F9 BIOS, I have 2.5A multi (So it's 200mhz FSB strap)

Quote by Fat_Bodybuilder
Quote by tantryl
Just pop the RAM on the x2.50 "divider".

So long as the RAM FSB is equal to or above the real CPU FSB (not the quad pumped FSB) you're fine.



Hey I was just wondering, since I don't use a mainboard that uses ratios, can you set the ram speed 'lower' than the FSB?



Well, theoretically we are using ratios, but it's hidden behind numbers.


Edited by c0nc0n: 7/9/2008 3:24:08 PM




Ummm... What?

-----

E8500 @ 4.0Ghz Daily || 2GB OCZ Special Ops || X38-DS4 || HD 4870   
ViewSonic 26" || Logitech Z4 || TJ07 || G11 and G5

c0nc0n 
7/9/08 5:53:08 PM
Champion

Our supposedly lack of ratios is just the Gigabyte naming scheme for their straps.

You know, 2.0A, 2.0B, 2.4B, 2.5A, 2.66C etc etc

That relates our FSB to DRAM frequency thus giving us the ratios in another form.

I hope I'm actually answering your question, rather than on some retarded tangent.

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E8500 (RIP Q9450) + Gigabyte EP45-DS3R + 4GB DDR2-1000 4-4-4-10 1T Ballistix Tracers + Gigabyte HD4850 512mb + X-Fi XtremeMusic w/ Razer Lycosa & Lachesis.
http://i203.photobucket.com/albums/aa256/c0nc0n3m0/lol.gif

I)ickie 
9/9/08 8:57:37 AM
Initiate
From my experience RAM is best left at FSB speed.
It leads to greater stability and longevity of the ram. I'm not sure what volts your ram requires at 1066 but if its anything more than 2.1v I wouldn't do it in the long run.
Use the lower clock speed to drop the latencies.

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