Am2 Overclocking

[Teacher]

I am probably asking something that is already been asked and covered. But I may not know exactly the terminology in the answers given. I am attempting an over clock on an AMD
5000 , base is 2600 MHz. I read the sticky labeled easy as 123. I get through the HT fine and it maxes out at about 1450 MHz.
To my knowledge the formula for this is reference x HT Multi. When I proceed to do the memory I lock the memory at 1 to 1. To my knowledge this means that I would need to run my
reference clock to 400 MHz to make my memory run at 800. It says in the sticky you would be ok starting at your base memory clock. Could someone help me with this step and also the formula of the reference and the cpu multiplier to get the actual memory speed. I will list my specs below.

AMD AM2 5000 @2600 MHz
Foxcon C51XEM2AA motherboard
Corsair XMS2 Pro 6400 memory 800 Mhz 4-4-4-12 timing
2 gig

Dual 7800 GT SLI configuration
Zalman CNPS9500 Heatsink
OCZ GameXtreme 700 watt power supply

 

[AlabamaCajun]

Not much has been published on AM2 but I've worked out most of the details and I'll start with the basic settings. Your cpu is on the 13 multi. Yes, you will want the base mem ref at 400 which doubles to 800. Problem is 400 will not divide into 2600 even resulting in 6.5 so the divider is set to 7 for RAM. This yields 2x371 = DDR2-743. To get to DDR2-800, you will have to raise the HTT to 215 * 13 will result with 2.8G. Problem is the 4x00 X2 AM2s are reluctant to run above 2.7.

Setting the CPU multi back to 12 will result in an even divider starting your ram as DDR800 (2400 / 6 = 400). Run the HTT up to 220 will result with 2640. RAM will hit 440 or DDR880. You may need to up VCore to hit this or higher.

 

[||Console||]

his stock clocks are 2.6 i would hope he can @ least get 2.8

 

[AlabamaCajun]

his stock clocks are 2.6 i would hope he can @ least get 2.8

I would like to think that it would but history says it will only do a little better than the lower siblings. I hope I'm wrong on this though.

 

[jamesgig]

I have a AM2 4000 running at 2940 from 2000 stock on the same heatsink as you. Your ram should be able to hit around 1000mhz, my kingston kit is running at 980mhz at 4-4-4-12 timings.
You may be able to raise your htt, Mine is at 294mhz x10.

 

[gmony01]

What are your temps on that 4000+. I'm have the Zalman 9500 also and at 2.7ghz i'm gettin 52-55c prime. I dunnno if this is normal or what for this HSF, its about the same for my stock hsf. In the bios I have to set the vcore to 1.4875 to keep stable in prime for 2.7. I dunno if its the ASUS board thats the problem or not. CPUZ will report the vcore at 1.51-1.56, but cpuz reports it at 1.32-1.37. What are your setting on that mobo jamesgig. Here is my setup:

AMD Athon 64 X2 4400+ 65w@2695 (245x11)
Asus M2N-SLI Deluxe
Corsair XMS2 pc2 5400 4-4-4-15@770mhz 1 gig(2x512)
HTT@981
Zalman CNPS9500 AM2
Bios [email protected]
Max temp 53c

 

[Teacher]

Ok so for temps umm mine are 35 celcius under game load. But I have not over clocked it fully yet. But meanwhile after the hijack. When you say run the memory at 400 Mhz let me tell you my bios settings for that section. The memory has the option of setting at 400 , 567 , 667 , 800 those are not exact numbers but close. That being said i should run my memory at 800 to max it out with a 7 cpu multi?

 

[jamesgig]

My settings are in my sig. Load temps for prime are about 58 C.

The memory settings are just dividers. Mine is set at 667, but the actual memory speed is 490mhz.

 

[AlabamaCajun]

My settings are in my sig. Load temps for prime are about 58 C.

The memory settings are just dividers. Mine is set at 667, but the actual memory speed is 490mhz.

Saaaweeeeet. I knew we might see some BA numbers out of these Windsors.

 

[AlabamaCajun]

Ok so for temps umm mine are 35 celcius under game load. But I have not over clocked it fully yet. But meanwhile after the hijack. When you say run the memory at 400 Mhz let me tell you my bios settings for that section. The memory has the option of setting at 400 , 567 , 667 , 800 those are not exact numbers but close. That being said i should run my memory at 800 to max it out with a 7 cpu multi?

Leave the CPU multi on 13, Set the RAM to 800, from what Jamesgig said, you should be able to run it up good. The 7 divider I spoke of is inside the BIOS, we don't see that. We only see the 400,533,667 and 800 numbers.

At HTT 226, 13 multi and RAM on 800 your ram should reach DDR 980 and your CPU will reach 2940. Note the ram is internally set to 6 which the formula is 2940/6 * 2 = 980. Remember to drop the LDT to 4X (LDT is the HT bus multiplier).

What I have found on this ddr2 is if it starts getting shaky, raise the last number up a notch. Thats the 4th or precharge number which is around 12-16. This precharge is more of a delay for refresh than a latancy as it does not directly affect reads and write as the first 3 numbers do.

 

[Moto7451]

Just to add to what AlabamaCajun said, I've found that a value higher than 18 leads to lower memory bandwidth on my setup so you'll want to watch out for that.