1:1 overclocking?

Custom / CUSTOM
July 22, 2009 at 05:41:06
Specs: Microsoft Windows XP Professional, 2.611 GHz / 3071 MB
what does 1:1 sdram or soemthing to soemthing
mean, cant you just make them unlinked and do
what you want?

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#1
July 22, 2009 at 07:32:13
"what does 1:1 sdram or soemthing to soemthing mean"

It is the CPU:DRAM ratio. When set to 1:1, they are both running at the same frequency. In other words, they are in sync. Or if it helps, they are "in tune" with each other. If you run them async (out of tune), wait states are created which degrades performance.

"cant you just make them unlinked and do what you want?"

If you don't mind taking a performance hit, sure, go right ahead.

BTW, the above applies to Intel systems prior to the i7 & AMD systems prior to the A64 which still use the old FSB system to communicate. AMD did away with the FSB a long time ago...Inetl finally did away with it with the Core i7.


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#2
July 22, 2009 at 07:35:38
thanks jam, so making sure therye equal means more
performance?

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#3
July 22, 2009 at 07:37:10
I just updated the above.

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Related Solutions

#4
July 22, 2009 at 07:39:59
thanks jam, so if your ram is at 800Mhz your FSB should be
800Mhz?

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#5
July 22, 2009 at 08:06:09
This is where it get's confusing. Intel "quad-pumps" the FSB. So 800MHz FSB actually runs at 200MHz. To be in sync at 1:1, you need to run the RAM at 200MHz (DDR400).

To make things even more confusing, the P4 & it's netburst architecture is very inefficient, so to get the best performance out of a P4 system, the RAM freq should be faster than the CPU freq. Either 3:4 or 4:5 depending on the CPU.

For a Core 2 system, testing has shown that running 1:2 ratio performs equally as well as 1:1 IF you can pull it off. So an 800MHz FSB Pentium dual core (Core 2 based) with DDR2-800 RAM would give you the 1:2 ratio. A 1066MHz FSB Core 2 Duo with DDR2-1066 would also give you a 1:2 ratio. But since many Core 2's will overclock to 1800-2000MHz FSB, you would most likely have to drop back to 1:1 again.

The original Pentium, P2's & P3's should always be run at 1:1...ditto for the AMD K6, K6-2, Athlon & Athlon XP.


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#6
July 22, 2009 at 08:09:21
so how would i got about a core 2 quad? with 800Mhz ram?

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#7
July 22, 2009 at 09:06:07
What's the default FSB...1333MHz? You'd need to run the RAM at 333MHz (DDR2-667) for 1:1 or 667MHz (DDR2-1333) for 1:2. Since you have DDR2-800, underclock it to 333MHz.

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#8
July 22, 2009 at 09:20:32
well thats rubbish ram performance, if my board only supports up
to 800Mhz can i buy 1066 and OC it to 1333?

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#9
July 22, 2009 at 09:38:23
Just set the CPU frequency at 400MHz (1600MHz FSB) & the RAM frequency at 400MHz (DDR2-800) & you'll be running 1:1 ratio. And if your CPU can handle the increase without lowering the multiplier, the CPU clock speed & system FSB will increase by 20%, the RAM will be running at it's designed speed & the overall system performance will improve. How is that rubbish?

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#10
July 22, 2009 at 10:02:15
sorry, i didnt understand, i thought id be paying for 800Mhz and
getting 667Mhz ram, which tbh is rubbish compared to faster
Mhz, so i should be getting 480Mhz ram speed (incl 20%
increase)

thanks jam.

Samsung 32" HDTV
Logitech DiNovo Mouse and Keyboard
Logitech X-540
Custom Built PC
Sky
80GB PS3 HDMI


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#11
July 22, 2009 at 10:42:21
"so i should be getting 480Mhz ram speed (incl 20%
increase)"

No, the CPU speed will increase by 20% because you'd be increase the FSB from 1333MHz to 1600MHz. The ratio would stay at 1:1, meaning your RAM would run at 400MHz (not 480MHz) rather than 333MHz.


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#12
July 22, 2009 at 10:47:07
so what speed would teh cpu be at ive tried calculating it and it
ends up at 2.1 Ghz, less then stock?

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#13
July 22, 2009 at 12:49:39
Which core 2 quad processor do you have? We can simplify the math for you.

2.66Ghz quads will run at 266Mhz fsb in the case of a Q6700 or 333Mhz fsb for the rest.

If you do the math like jam explained, 1333Mhz/4=333Mhz fsb.
and
2660Mhz(your cpu speed)/333Mhz fsb=8. That's your multiplier for the cpu.
therefore
400*8=3200Mhz or 3.2Ghz; a pretty lively increase from 2.66Ghz.

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#14
July 22, 2009 at 12:56:27
yeah its a q6700 core2quad.

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#15
July 22, 2009 at 13:27:40
Thanks; I meant Q6700 (not Q6600) and edited my reply.

That means your Q6700 is running a default 1066/4 or 266Mhz fsb.

http://ark.intel.com/Product.aspx?i...

So, 2660/266=10 is your cpu multiplier.

Read Response Number 5 from jam as necessary until you understand it. Your starting point for a 1:1 ratio is to underclock your memory to 266Mhz.

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#16
July 23, 2009 at 00:37:43
i get it now, thanks all.

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