Confused - Please Help

[Peaks]

I have a Gigabyte GA-EP45-UD3P Motherboard and I am pretty confused about how the BIOS settings work.

I am not sure what the System Memory Multiplier does. Is this similar to the CPU:RAM ratio? When I change this the memory freq changes. In CPUz it says my CPU:RAM is running at 5:8 ???

Also what is the MCH Frequency Latch?? The motherboard manual doesn't shed much light on this at all. If anyone with any knowledge of this MoBo and BIOS could help that would be greatly appreciated.

 

[fullmetall]

what kind of ram are youn running? cause there running at 5-7-7-20, thats pretty high, usually runs around 5-5-5-18 or -15.

 

[fullmetall]

For best performance, the CPU & RAM should run at the same frequency...in other words, 1:1 ratio. Any other ratio setting will create a bottleneck in either the RAM or the CPU.

Assuming a CPU Frequency of 200MHz & PC3200 RAM:

1:1 = 200mhz/200MHz

5:4 = 200MHz/160MHz - to get the RAM speed up to 200MHz, you'd have to raise the CPU freq to 250MHz. RAM is the bottleneck.

3:4 = 200MHz/266MHz - to get the RAM speed down to 200MHz, you'd have to lower the CPU freq to 150MHz. CPU is the bottleneck.

 

[Peaks]

My RAM is the OCZ 4GB (2x2GB) PC2-8500C5 1066MHz Reaper HPC Edition Dual Channel DDR2 (OCZ2RPR10664GK)

http://www.overclockers.co.uk/showproduct.php?prodid=MY-110-OC&groupid=701&catid=8&subcat=817

I understand that they need to be at 1:1 for best performance but in my BIOS I dont understand where to set that. So what is 5:8 in CPUz. I read somewhere that CPUz doesn't represent the ratio how it is in the BIOS.

 

[fullmetall]

i dont think you would set it in the bios, it runs off how evenly matched your mhz are in cpu and ram. its a ratio, you can't evenly match a ratio by hand.

your latency on your ocz's are to high. i have the ocz reaper's copper piped, running 5-5-5-15. run em at 5-5-5-18.

 

[Peaks]

Ok I will do that thanks. But do you not know anything about the two BIOS features I mentioned?

MCH Frequency Latch?
System Memory Multiplier?

 

[fullmetall]

the multiplier can be set in bios, just have to disable auto set.

the higher your multiplier is, the easier your cpu will overclock, but, it will also rely on your voltage settings aswell as your clock speed and fsb settings.

 

[fullmetall]

what is your motherboard?

 

[Peaks]

Interesting? It says in the manual that options for the multiplier are dependent on the CPU freq and the Memory Latch. I thought this would have something to do with the speed or your RAM in comparison to the speed of your CPU?

My motherboard is the Gigabyte GA-EP45-UD3P

 

[fullmetall]

See by showing what you showed up top, is bottlenecking the cpu, overpowering the ram and underpowering your cpu, you probably have a low fsb and multiplier.
check your frequency settings and see about changing a couple things cause your running slow times on your memory. tighter timings the better the speed which you probably already know.

 

[fullmetall]

I would have to read in more detail about multiplier's and voltage settings to get an exact point of what your needing but, showing what you showed should have given you atleast a bit of something.