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Help with 1:1 CPU:RAM ratio

post #1 of 6
Thread Starter 
I had overclocked my cpu to 3.7 ... Now after 1 day not using it, he says my pc is running back @ 3.0 ... How could this happen?

edit: nvm, EIST was on, don't know HOW, but it was on...


now another question, what does ratio 1:1 mean? i'm currently using ratio: Full ... Can somebody explain

thnx
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post #2 of 6
Did you check and make sure you saved your BIOS settings before you exited? Always use F10 to exit, that way you are sure it will save.

A 1:1 ratio has to do with the FSB speed and the memory. I'm fairly new to OCing, so I can't explain it in full, but I'm sure there's an FAQ around here some where.

Good luck, and nice OC, what's your vcore at?
post #3 of 6
Thread Starter 
default vcore, it's 1.408 ... and I saved them, maybe mistake I made earlier I dunno



and btw, default cooling @ 50°C max load
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2* 160 GB s-ATA Windows XP sp2 Sigma 17" TFT standard 
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post #4 of 6
Pretty sweet. What's your FSB and multipler? My mobo's got my multiplier locked, and it's not stable just upping the FSB past what I've got now... so I'm stuck 'till I get my 3700+ Sandy.
post #5 of 6
Quote:
Originally Posted by Ice-Cold
what does ratio 1:1 mean?
A ratio is a division of two numbers. 1:1 is the same as 1/1 or 1 divided by 1. Thus a CPU/RAM ratio of 1:1 means that the ram is running at the same speed as the cpu.

Most overclocking motherboards allow for the CPU:RAM ratio to be selectable at 4:3, 1:1, and to 3:4 and some even have more selections.

4:3 means that the CPU runs ~1.33 speed of the ram. Thus a CPU running at 250MHz will yield a 1.250 ratio and the ram will be running at 187MHz.
1:1 means that the CPU runs at the same speed of the ram. Thus a CPU running at 250MHz will yield a 1.0 ratio and the ram will be running at 250MHz.
3:4 means that the CPU runs a .750 ratio and the ram will be running at ~333MHz.

Thus if you are using ram that allows you 2-2-2-5 @ 200MHz but wish to run your cpu higher you can run it asynchronously to your ram. You can then run your CPU (If it makes such an increase) at 269MHz and at a 3:4 divider you will get 269/200 and can achieve the tight timings of 2-2-2-5.

You could also (with the right ram) choose 1:1 with 269MHz and looser timings of say 2.5-3-3-7. This means the ram will run faster but will connect slower transfer. It's a trade off and if you purchase the correct ram then you can play with all the settings to find your best CPU/DRAM and timings.

hth,

R
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post #6 of 6
Quote:
Originally Posted by Ice-Cold
now another question, what does ratio 1:1 mean? i'm currently using ratio: Full ... Can somebody explain
thnx
Intel CPUs use what's commonly called a Front Side Bus (aka FSB) to connect all of the major components such as the CPU, memory, chipset, and AGP socket.
On the most recent Pentium 4 models this FSB runs at a frequency of 200 MHz. However there are two things to keep in mind as this is where it can get confusing.
1) Intel Pentium 4 CPUs are quad pumped, meaning they can send 4 data "packets" (if I may call it so) per CPU clock cycle. Thus the effective frequency of Pentium 4 CPUs is normally 800 MHz (4 x FSB Freq. = 4 x 200 MHz).
2) Most recent RAM technology on the market is called DDR (Double Data Rate) and it can send 2 data "packets" per clock cycle. Let's take for example DDR RAM rated at 400: Its effective frequency is 400 MHz (2 x FSB Freq. = 2 x 200 MHz).
So if you have a Pentium 4 CPU with DDR 400 RAM they will both be running in synchronization at their original 200 MHz frequency.

Now let's say you start increasing your FSB to 220 MHz. What happens is your CPU is now running at 880 MHz (4 x 220 MHz) and your RAM is running at 440 MHz (2 x 220 MHz). Everything is great so far because both the CPU and RAM are running at the same frequency which is 220 MHz. Their speeds match and this is why the FSB:RAM ratio (or divider) is 1:1.
Suppose you continue increasing your FSB to 260 and your RAM cannot keep up with this frequency. It will lower its speed to say 208 MHz in comparison to that of the CPU which can easily sustain a frequency of 260 MHz. Now your CPU and RAM speeds do not match anymore. RAM is running slower than the CPU and the FSB:RAM ratio is 260/208 = 5/4.
Hope that helps
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