TWIN2X2048-6400 working at 718MHz and in Single Channel

[Nattefrost]

Hello, just 2 hours ago I finished to mount my PC and installed Windows Vista.

 

All works fine, except the memory (I mean the memory works perfect but at 718mhz speed and in single channel) :(.. So I wanted to ask u guys how/what must I do to get it running at 800MHz like it's writhed on the box and in dual channel ??

 

Many thanks!! Alex

[Wired]

There is no such thing as Dual Channel memory, as this is a property of the memory controller in how it handles memory. This is why you can place memory in different slot configurations on a motherboard and it will register as single or dual channel. In otherwords, the memory's in the wrong slots. Check the motherboard manual.

 

As for the speed, that's just odd. I'd check out the speed in dual channel, see if it's normal.

[Nattefrost]

Well, what can I say.. I'm half way there, thanks to Wired (thanks bro), they didn't work because I inserted them in the wrong slots.. Now is working as dual and they work almost 50% better, but still at 718mhz (359mhz).

 

Here are some results in Everest between single and dual channel:

 

****single-dual

Read 5506-7290

write 5526-7073

copy 5266-7769

 

thanks a lot Wired, and if I don't ask to much from you, can u help me with the other problem too?? They are still working at 718Mhz (at least Everest and CPU-z told me that way).

 

Thanks

[Wired]

What's your HyperTransport Multiplier and CPU Multiplier set to? I'd guess 5 and 9 respectively. IIRC some of the X2s have odd ratios like that, which causes this. It's normal, and you could OC the rig to get the memory up to DDR2-800 speeds.

[Nattefrost]

I have the HyperTransport set to "Automatic" and the CPU Multiplier to x12.5

 

Here is a CPU-z summary:

 

care speed: 2513.1mhz

Multiplier: x12.5

Buss speed: 200.9mhz

HT Link: 1005.2mhz

 

What must I overclock? The multiplier? To what valor?

 

Thanks again, Wired.

[Wired]

Not sure to be honest, just know of the design quirk :)

[DerekT]

I have the HyperTransport set to "Automatic" and the CPU Multiplier to x12.5

 

Here is a CPU-z summary:

 

care speed: 2513.1mhz

Multiplier: x12.5

Buss speed: 200.9mhz

HT Link: 1005.2mhz

 

What must I overclock? The multiplier? To what valor?

 

Thanks again, Wired.

 

The equation is:

 

reference clock x multiplier = processor/memory controller speed / divisor = memory DIMM speed

 

The reference clock is 200Mhz. Your CPU is a 4800+

 

Therefore:

 

200MHz (reference clock) x 12.5 = 2500MHz (CPU and memory controller speed) / 7 = DDR2-PC6400 running @ ~357MHz (DDR = 357 X 2 ~=718MHz)

 

Since full integer multipliers and divisors (as opposed to half-integer multipliers like "6.5") are used in your system you will notice that AMD64 processors run at frequencies that are multiples of 200. Remove your half integer multiplier by setting the multiplier to 12. This will drop your divisor from 7 to 6.

 

200MHz (reference clock) x 12 = 2400MHz (CPU and memory controller speed) / 6 = DDR2-PC6400 running @ ~400MHz (DDR = 400 X 2 ~=800MHz)

[Nattefrost]

Yes man, It works, thanks!!

 

still not a big difference between 718mhz and 800mhz .. i put the multiplier to 12x (2400MHz) and 14x (2800MHz) both ways works at 800Mhz!

 

Thanks again mates!!

[DerekT]

Yes man, It works, thanks!!

 

still not a big difference between 718mhz and 800mhz .. i put the multiplier to 12x (2400MHz) and 14x (2800MHz) both ways works at 800Mhz!

 

Thanks again mates!!

 

You're welcome.

[Nattefrost]

The equation is:

 

reference clock x multiplier = processor/memory controller speed / divisor = memory DIMM speed

 

The reference clock is 200Mhz. Your CPU is a 4800+

 

Therefore:

 

200MHz (reference clock) x 12.5 = 2500MHz (CPU and memory controller speed) / 7 = DDR2-PC6400 running @ ~357MHz (DDR = 357 X 2 ~=718MHz)

 

Since full integer multipliers and divisors (as opposed to half-integer multipliers like "6.5") are used in your system you will notice that AMD64 processors run at frequencies that are multiples of 200. Remove your half integer multiplier by setting the multiplier to 12. This will drop your divisor from 7 to 6.

 

200MHz (reference clock) x 12 = 2400MHz (CPU and memory controller speed) / 6 = DDR2-PC6400 running @ ~400MHz (DDR = 400 X 2 ~=800MHz)

 

hello DerekT, i just sold the corsairs and i want to buy the dominators at 1066 mhz (ddr2).. but can u say me the formula how to calculate the running speed with the CPU like u did in one message above, thanks.

[Nattefrost]

i did some mats and .. i don't know.. it it possible to work like this?

 

200MHz (reference clock) x 12.5 = 2500MHz (CPU and memory controller speed) / 10 = DDR2-PC8500 running @ ~250MHz (DDR = 250 X 4 ~=1000MHz)

 

or

 

200MHz (reference clock) x 12 = 2400MHz (CPU and memory controller speed) / 9 = DDR2-PC8500 running @ ~266.66MHz (DDR = 266.66 X 4 ~=1066.66MHz)

 

it is correct?? thanks!

[Wired]

Math looks ok.

[Nattefrost]

thanks WIred, i'll go get them :D