need help overclocking A64 3700 san diego , more questions added

[hclarkjr]

i only want a modest overclock of 2.5GHZ and want to know which settings to use to get there using the hardware in my signature. i have the stock AMD heatsink with the 4 copper pipes that reviewed real well against other 3rd party HSF's. i read the guide at the top and am confused by the memory divider and HTT setting. thank you to all that reply

 

[Megatomic]

Harry, that chip you have has been stably overclocked to 2.7GHz. I ran it at 2.5GHz most of the time by running with HTT at 250 (cpu mult. at 10x) and the memory on DDR333 (5:6) divider. I don't have any knowledge of your board's BIOS settings so I can't tell you more than that. You shouldn't have to run with a high Vcore to do that either, on my EVGA board as well as this ASUS board it only took like 1.45V tops and it was prime stable.

Good luck man.

 

[hclarkjr]

thank you, i had no idea what was involved in overclocking these till i got into the bios and looked around.

 

[hclarkjr]

so for the NB-CPU bridge i leave it at 1000 correct? same for the NB-SB at 1000 and drop the multi to 10X and raise the HTT\FSB to 250 and increase the CPU Vcore to 1.45 and lower the memory to 166FSB. am i leaving anything out? what happens if my system doesn't like the settings? on my abit an7 if you did something it did not like you could hold the insert key and press the power button to go to last bootable setting, is that true for all motherboards? how about async and the other one i can not remember the name of? which one to set it too?

 

[GuitarDaddy]

Originally posted by: hclarkjr
so for the NB-CPU bridge i leave it at 1000 correct? same for the NB-SB at 1000 and drop the multi to 10X and raise the HTT\FSB to 250 and increase the CPU Vcore to 1.45 and lower the memory to 166FSB. am i leaving anything out? what happens if my system doesn't like the settings? on my abit an7 if you did something it did not like you could hold the insert key and press the power button to go to last bootable setting, is that true for all motherboards? how about async and the other one i can not remember the name of? which one to set it too?

You need to drop the NB-SB and NB-CPU down to 800

 

[Pyrokinetic]

While I am not familiar with the ASRock board, I have my 3700+ stable overclocked to 2.8Ghz on an ASUS A8V-E Deluxe with an XP-120 heatsink.

I am using a CPU clock of 255 with the 11 multiplier.
My Vcore is set at 1.5625v
Using the 166 memory divider (DDR333)

The CPU-NB link (LDT) is linked to your CPU clock. The multiplier times the CPU clock should not exceed 1050. The safe bet would be to drop it to 800 (4x).

To explain the role of the memory divider, I'll walk through your settings: 250x10=2500.
Using the 166 memory divider, you are dividing the CPU multiplier by (5/6): 10/(5/6)=12.
Thus, for determining the memory speed, you are effectively dividing the 2500 by 12:
2500/12=208.33 or roughly DDR417.

Your only other concern would be if your memory (assuming native DDR400 sticks) can run at DDR417 with the stock DDR400 SPD settings.

As for BIOS resetting, not all do it the Abit way, so consult your motherboard manual.

 

[hclarkjr]

well i am using OCZ PC3200 EL PLATS that are in my signature so i am pretty sure they will run at the settings you say.

 

[hclarkjr]

which setting for async and sync do you use when overclocking?

 

[Pyrokinetic]

Async and sync refer to whether you want the subsystem to run linked to the CPU clock or independent. For the PCI and PCIEx clocks, if you are overclocking, you want to keep them at stock speeds, so you would run in async mode, and leave them at autodetected settings. Changing those setting will really mess stuff up.

 

[hclarkjr]

i tried it at sync setting with HTT setting of 240, memory at DDR 333, NB-SB and NB-CPU at 800, multiplier at 10. what does the PCIE bus do? is that also for AGP video card? it is overclocked to 2.4 GHZ right now at that setting and running smooth with no trouble so far.

 

[hclarkjr]

well did some reading and put it a async and bumped the HTT to 245 at stock voltages and all is running smooth. 2.46 GHZ now.

 

[jefflovesarlene]

You may not believe this (can supply my settings later on) I have a GA_K8NSC-939 mobo 1.25 gig of single channel ram. I bought the 3700 SD chip (2.2 ghz), know nothing about overclocking and simply went in the bios and jacked it up from 200mhz to 252mhz (now its running at 2.75 and almost hitting 2.8. All I did was keep everything to auto and the mother board does the rest. I ran prime 95, cpuz, etc. Temp is 28 C and is so stable. I use the stock heat sink and fan. Maybe I got lucky or maybe its just easy to do what I did. The moment I took out my single channel ram and put in Patriot (dual channel) ddr 1gb I had to crank down my overclock to 230 mhz so I could run stable. I did a performance test before and after and I get better performance from single channel than dual. I always thought dual would be better?

 

[AdamK47]

I had my 3700+ SD running at 2700MHz with 1.5V using water cooling. My waterblock cracked not too long ago and I put the stock heatsink/fan on there. It runs only 4 or 5 degrees hotter, but it still remains just as stable at 2700MHz with the same settings. I use a 300MHz bus and a 4x HTT multiplier for a 1200 HTT bus. My 2GB of memory is set to 3/4 which makes it 225MHz for an effective 450 DDR memory speed.

You should be able to run it at 2.5GHz without raising any voltages. Set the CPU multiplier to 10x and the bus speed to 250. Set the HTT to 4x and the memory divider to 5/6 or 333 depending on how it is labeled in you BIOS.