Help with O/C'ing 3700 SD

kemistry

kemistry

kemistry

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17 Oct 2003
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Hull, East Yorkshire
Basically im running a 3700SD/MSI K8N NEO2 plat/1gb infineon :( ddr400.
Now i think im running a divider, as i know the rams really bad but ive managed to get 2530 out of the SD while the ram mhz is at 191 (timings are 2-2-5-2). This setup is completely stable, but im sure i can get more out of the chip. As soon as i go over 230fsb windows wont boot. Im running 1.5v and im pretty sure everything else is standard.

Is there any way of getting more out of the chip without having to buy some proper ram? :)

Thanks
 
think ure safe to put the DDR voltage upto .9 so try and then up the fsb a bit more, mine became unstable about that point so i changed to .9 and its fine :)
 
the memory voltage starts from 2.5 and only goes upto 2.85, with the last 3 options flashing red saying danger!

sorry im abit new to the whole thing and dont really know much about it!
 
Im quite new to Overclocking too and also bought a 3700 SD and asus AV8 Deluxe Board , Im running a muliplier of 10.5 and FSB at 250 my ram timings are 2.5
3
3
7
10
16

memorys running at 201 MHZ but with a bios memory set to 3:2 cpu to memory ratio.

looking down the list using CPU-Z , so far running at 2.63Ghz , this is with stock volts( test using prime95 for 4 hours on blend) . I was able to run at 2.8ghz using higher volts but this meant hotter cpu and ive built my pc to be quiet but cool so slight compromise. Cant complain with stock volts. i might run it at the moment it runs about 32c idle and 42c on load and freezer pro cooler running at 1400rpm which is silent

Any tips to get better result would also be appreciated.
 
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Sounds to me that you haven't dropped the HTT Multiplier - no board will go over 230MHz if you don't do this.

This will default to 5x and should be lowered to 4x. Google it / look at some OCing guides. For reference, the multi x the FSB should always be less than 1000. You have 230 x 5 there, so it won't work.
 
ive tried upping the mem voltage and the same thing happens

i have this thing called Adjust CPU Ratio (going upto x11), its on the startup setting atm, but what is this?
 
kemistry said:
ive tried upping the mem voltage and the same thing happens

i have this thing called Adjust CPU Ratio (going upto x11), its on the startup setting atm, but what is this?
Click to expand...

The CPU ratio is the multiplier. CPU speed is front side bus (the 1:1 memory speed) * the multiplier. On the AMD 64's on all but the FX range the multiplier is locked and cant be modified**.

**its probably possible with a fair amount of arsing around and silver paint

With an AMD64 setup you have 3 "major" bits you need to work out and set correctly

1) Bus speed/memory clock - this will default at 200MHz
2) CPU ratio - this is stuck at a set value
3) HTT - HyperTransporT- this is a multiplier of the bus/memory clock

As the bus speed goes up the CPU goes quicker due to the multiplier. On a x10 multiplier (make figures easy) you'd start with a 2.2 gig processor (further confused by the AMD speed rating). For each Mhz you add to the bus speed your processor gains 10Mhz. The HTT gains 4/5mhz (depending on the multiplier set - default is 5 so even 1Mhz increase of Bus speed takes you to 1005Mhz which is over the "safe" limit).

To achieve an overlock your looking to increase the Bus speed thus getting more from the CPU due to the ratio. Other bits cant handle the speed increase (mainly the HTT) so the multiplier on these needs to be dropped to balance things. As said HTT cant go over 1000Mhz as a rule of thumb.

As the memory works at the bus speed your memory also has to be able to handle the increase, this is where the memory/bus ratio setting comes in. At 200Mhz bus your RAM is running at 200Mhz DDR also known as PC3200. To keep ram stable you either use the ratio setting (so at 4:3 the ram is running at 150Mhz DDR to start with) or get Ram that can take a higher setting. This leads to a whole thing about memory speed vs memory timings which you'll have better answers from the memory section on.

The above is a very basic explanation without any real practical "method" but covers most of the terms and ideas you'll need to know and get your head around before you can start to make use of other advice given :)
Sorry if any of that covered ground you knew, handy educational bit anyway hopefully.
 
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Cheers for clearing a lot of that up Mercutio, i suppose i shouldve just read some sites to save you lot the hassle! (too lazy :D)

But im still having the problem of not being able to boot after going over 230, even after messing around with voltages. All my temps are fine btw, cpu is 38 and my case is around 28-30.

I suspect its just the cruddy ram, but surely if it can run 200mhz without a divider, i should be able to do the same with a divider? (Its currently at 191mhz)
 
Mercutio is mostly right although the multi's on A64 can be changed (only downwards though). Also, a SD3700 would default to 2200 (200 htt x 11 multi).
Look in the OCers guide on this or the CPU threads or even google for some advice.
Just as a rule of thumb, my specs as we speak are below.
Cpu speed = 2640 (11 multi x 240 HTT) @ 1.55volts
Mem speed = 188mhz (on a 166 divider) @ 2.5/3/3/7
32C at idle
 
Could be the cpu not liking going over 2.5gig or could be the board. I also have an MSI board and 2.5 is my limit aswell. Temps are at 28'c idle and 34'c max on 1.45v but no amount of volts will let be boot up any faster :confused:
So not sure if my board won't let me or if the chip just won't go more than 2.5gig :confused:
 
run a Divider so the memory sames the same speed or even ocs, I am on DDR333 divider with DDr400 memory. Check my sig for speed, have you set the LDT to 4x(for under 250FSB) or 3x(For over 250 FSB).
 
Have tried already with a 166 divider on the memory so its underclocked to rule that out and with the htt multiplyer set at 4x but still doesn't like going any higher :( Just get the windows loading screen and when it goes to sign in it just reboots :confused:
 
Put your multi as low as will go and use as low a divider as you can. Then just keep upping the HTT, this will test how far the mobo will go as the CPU and MEM will be massively underperforming so will not be tested.
Once you have found the limit of the mobo then put the mem at 1:1 but keep the Multi low so you are just testing the mem. This will give you the max speed of your mem.
 
TURN AGGRESSIVE TIMINGS OFF. This worked a TREAT for me :D. I'm 100% sure that'll fix your problem as I have this exact same mobo and had the exact same problem with 230fsb - even on a divider.
 
yeah thats one thing i havent tried, i know 2-5-2-2 is pretty tight timings yeah? (well i dont know) so ill give that a go. cheers
 
seems that it was my memory timings that was holding me back, I thought that on the divider I could still run the tight stock timings but it appears not. Now I've got them at 2.5-3-3-6 on a 166 divider I'm now 8 hours into prime at 2.8 gig (255x11) @ 1.55v :D :D

Thanks a lot for the point in the right direction :)
 
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