1066mhz ram into 800mhz board.

[WBaS]

Originally Posted by Kerelm

I understand what needs to be done now but i wasnt able to boot with a lower multi and higher fsb for some reason. im not sure even with the ratio being to standard clock speed or lower.

What FSB are you running at now? It is possible that the FSB is too high for your board. You may need to boost the chipset voltage and see if that helps.

I didn't understand your second sentence. What ratio and what do you have it set as?

[rx7speed]

Originally Posted by skunksmash

lol.....im not too hot on AMD setups but im sure there will be some form of ram divider in the advanced options of the bios

also see how tight you can get the timings @ 800mhz you may find that
800mhz with cl4 or maybe with some hefty voltage cl3 .. will be quicker than 1066mhz with cl5 timings

but thats the fun......

enjoy

1000mhz at cl5 is the same as 800 at cl4 other then the 1000mhz is operating at a higher frequency and so will have a higher bandwidth.

it's all in how ram works. the cl4 or cl5 is how many clock cycles it takes to do a given task for the timings they are NOT an absolute value.

do the math and you will see it's the same thing for latency

Originally Posted by laurie

your FSB, its dual channel memory so you need to x it by 2.

dual channel doesn't effect this. you multiply by 2 because it is double data rate ram hence the DDR. this would happen with both a single stick or two sticks. what this refers to is that the ram sends data on both the up and the down slope of the signal.

dual channel refers to having two sticks of ram. the frequency stays the same when you do this but instead what you are doing is doubling the data width. a single stick of ram has a data pipe of 64bits, but when you do dual channel the data pipe goes up to 128bits. your frequency though is still the same here.

Originally Posted by Ecchi-BANZAII!!!

I doubt AMD boards can't use SPD and use a PC2-8500 on a PC2-6400 board...

your right amd boards do use the SPD. once you overclock though the SPD becomes more or less worthless. the other thing is if the boad followed JEDEC (or whatever it is) standards then chances are the board doesn't "support" 1066mhz ram. sure it should work just manually needs to be set though.

[The Duke]

This chatter about the "SPD" is a bit confusing.
The "SPD" is the default timings the RAM uses, they can, in most OCable MBs be altered.

In your case, to the OP, you'll likely be fine with the SPD settings since your default DDR2 800 setting and the room your RAM has to increase in speed should work out fine.
Once you find out how high you can get the CPU and RAM speed @ 1:1 you may be able to tighten the SPD timings if necessary.


BTW, take a look at ddr2-ram-dividers
You can see what the various changes in speed are dependent on the CPU multiplier and divider. Even though you won't likely need a divider unless you drop your CPU multiplier a lot. The chart is helpful to get the understanding of what happens with various timing, multiplier and dividers do to the RAMs relative speed.

BTW, a 5600+ @ 3.3 is a very good OC, nice work

[laurie]

That link I cant get to work. would like to see it though

[WBaS]

Originally Posted by laurie

That link I cant get to work. would like to see it though

You can get to that link through my sig as well. Go to the overclocking guides for beginners. I have it linked in there as well.

[Ecchi-BANZAII!!!]

Originally Posted by rx7speed

Woohoo!!!

And AMD isn't in need for MHz so much as Intel Boards anyway, just getting low CL speeds give them big boasts. infact my friends low-end mobo (AMD) is 20% faster than mine AMD>Intel when it comes to RAM

[rx7speed]

you could of quotd the portion you where refering to as it would make it easier to make sense rather then just put a random quote there.

it doesn't hurt to have more mhz. low CL speed always helps but you have to understand the relationship of CL to the mhz. the CL is not an absolute value but FULLY based upon the Mhz. if you double frequency you can double the timing values and still have the same latency.


there are a lot more variables there then just AMD vs Intel.
I gained almost 10-15% I believe it was going from a p965 board to a p35 board. that's intel vs intel there.