hi all
im going to risk overclocking my 2.5 ghz P4 on a p4v8x-x asus motherboard i try to overclock 20% or any
and i go to restart the pc and when its starts to log onto windows it just sits so then i have to restart the pc and change them back to normal,

specs, 2.5 ghz 1 gb 3200 memory, and normal fan cooling, 29c cpu, 26, load anthink up to 40c and 45

any help, or information on this will be nice!
thank you for your corporation

It sounds like you know what your doing. Just keep at it. This is the master overclockers guide : http://forums.pcapex.com/showthread.php?t=37951

Its for the amd 64 but the jist of overclocking and the mechanics to it are their.

Find the max FSB, Tighten the timings on the memory, Bump it the multiplyer tell she crys. Dont forget to watch the ldt(pentium)/htt(for amd). This is what makes fsb go faster. You want it around 1000. If it goes under or over it becomes unstable. For example fsb of 250 and ldt of 4 = 1000, aim for somthing like that. But then again you probably should wait for Solid or zenzo to come back. Spike shot and Cpu killer no alot more about overclocking than i do.

20 percent?? Is that a setting or what? I bump the FSB up 3 or so MHz a time and boot, repeat until unsable. Add more voltage and go again until uncomfortable with temps/voltage. If thats an auto overclocking setting or something thats not a good way to go, do it the manual way.

Man, I have been overclocking Intel and AMD CPUs for several years now and I dont know what that idt/htt thing is.

But first things first, I have never heard of a 2.5 Gig P4. All the P4 CPUs I know of run 2.4, 2.6, 2.8 etc.... I'll do some research on that one. And I will read that OC guide just to see how it's layed out and what may be new over the last few months. I have been outa the scene for a little over half a year, things change fast in this game.

One quick question, where did your system and in particular, that CPU come from ? Retail from an on-line seller, Mom-and-Pop store, name brand manufacturer like Dell ?

Need a lay down of all your gear by manufacturer and model as well, everything that you can. Exact markings on the CPU if you can get them without too much hassle. They are printed right on the heat spreader on top of the CPU.


Thanx

hi ,
well i overclocked the cpu about 10 % reads 2.7 ghz , right its stable till i play vietnam and about 5 mins in the pc just crashes temp when overclocked r normal 29 c ? whats going on, u think i need better cooling fan?

Well, first off, I guess I missed the entire 2.5 Gig revolution in Northwood chips.

As for your temps and the crashing. Time for a sanity check, what is your room temp, don't guess, don't look at the thermistate on the wall in the hallway. Check your room with some kind of thermometer please. Let us know what you get please

my room temp is 19.2 c

Ok, 19.2 C, so we don't necessarily have bad temp readings throwing you off.

If I understood your post correctly, your Overclocked and when you make it do real work it crashes, but you still read good temps. Sounds like memory instability to me. I don't know all the things you have or havn't done to your system settings so it's hard to know for sure. You can back off the timings a little and see how it acts.

BTW, you said it was stable, what method do you use to test for stability after a change in your overclocked settings ?

I run a series of my favorite benchmarks after every setting change, and then when I think I have my highest stable settings, I game like mad

well i dont i only used cpuz to see how much overclock has done, then i just play vietnam. memory is kingston memory one is 512, and 2 256, people say they can overclock there cpu from 2.5 to 3 ghz, 30 % increase but i cant overclock more the 10% ?

Does the memory divider in your bios have the memory running by speed?(1:1, or 100%). If you have it running by speed, or in sync, with your frontside bus then that might be whats causing you to crash. Try loosening the timings of your memory if you want to remain in sync, or change your memory divider so that the memory isnt running as fast as the FSB. Oh, and Icpiper, He probably has a 2.6 northy....My 2.6 was recognized as 2.53GHz in Windows

lossen up timings or set the memory for lower mhz for example 166mhz and overclock then. If its still not working id say its a mainboard issue

Hi, well i thort id overclock see if it crashed again, so i overclocked it to 2.8 ghz and i run 3dmark2003 and got 6000 with 5900xt increase and no crashes? but when i play vietnam it crashes? got to help im a newb at this

I can try to offer you some help since I know a little about the auto overclock options on ASUS P4 boards. Basically that auto overclock option is useless. In order to overclock you are going to need to adjust other settings than just picking between 10/20/30 percent overclock. You might need to adjust memory timings,cpu vcore, ddr voltage etc. When you do the auto overclock on the board all its doing is adjusting upping the front side bus. It keeps your ram in 1:1 ratio so the faster your FSB is the faster your ram is going to be. If you don't have good ram this may cause intability issues.

Before I continue to help can you give some information on the ram. Like what are the memory timings, what speed is the memory?
Also what type of heatsink do you have on there?

erm, i dont know much m8 about it, memory is kingston 3200 400mhz one 512 2 256 mb. what does fsb stand for? and timings? and my heatsink is basic one go with pc on cpuz it says FSB at 146 mhz bus speed 584

We cant help you if we dont know what your memory timings are. Look for cas latency, ras-to-cas, etc in your bios. They will have a number next to them...those are your memory timings. There will be four numbers,one for cas latency, one for ras-to-cas, etc. Tell us what those four numbers are

OK, since you are having a problem there must be something that's wrong somewhere.

We have a pretty good idea what gear you have.
2.5 ghz P4 Northwood
Asus p4v8x-x Motherboard
Kingston 3200 400mhz one 512, 2 256 mb

But the memory issue is a big possibility. Although loosening the timings may fix the crashes, I don't like making adjustments without really having figured out what the real issues are.

Let me give you an example;

Here are data sets on several types of kingston RAM as sold and listed at Newegg.com;


Model#: KVR400X64C3A/512
Manufacturer: Kingston
Speed: DDR400(PC3200)
Type: 184 Pin DDR SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 3-3-3
Support Voltage: 2.6V
Bandwidth: 3.2GB/s
Organization: 64M x 64 -Bit
Warranty: Lifetime

Model#: KVR400X72C3A/512
Manufacturer: Kingston
Speed: DDR400(PC3200)
Type: 184 Pin DDR SDRAM
Error Checking: ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 3
Support Voltage: 2.6V
Bandwidth: 3.2GB/s
Organization: 64M x 72 -Bit
Warranty: Lifetime


Model#: KVR400X64C3A/256
Manufacturer: Kingston
Speed: DDR400(PC3200)
Type: 184 Pin DDR SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 3
Support Voltage: 2.6V
Bandwidth: 3.2GB/s
Organization: 32M x 64 -Bit
Warranty: Lifetime


Model#: KVR400X64C25/256
Manufacturer: Kingston
Speed: DDR400(PC3200)
Type: 184 Pin DDR SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 2.5
Support Voltage: 2.6V
Bandwidth: 3.2GB/s
Organization: 32M x 64 -Bit
Warranty: Lifetime

OK, first just look at the last two modules, the 256MB ones. Notice that the Cas Latency settings are different. And check the top 512MB module, it is different as well. Now I will address BIOS settings, you see, each module has a small chip on it called a PLL chip, this holds info about what the module is, and what the correct settings on the module should be. If you set the memory timings to Auto in the BIOS, then it will read this PLL to get the settings. But.... when you have more then one module, Auto will only read the PLL from the first module, (Usually the DRAM0 slot). Therefore, if you have your best module up front and the BIOS reads that mudule's PLL, any other modules installed will be forced to try and run at the first one's settings. Some can, some can't keep up though. Some will only fail when stressed. Also, if the first module is say the bigger one, the 512MB module, the others won't usually have a problem until the first one gets "full" and the system trys to actually write/read to the other modules. This can be a problem on non-overclocked systems, but on an overclocked system, well the problem just gets worse.

So, let's just say for arguements sake that both of you 256MB modules are the same model, and that the first 512MB one listed is also what you have. (The second 512mb module is an ECC module and Non-ECC is much more commonly used in home PCs). The least aggresive Cas Latency setting listed for any of these modules is 3. Dram voltage is 2.6V. And now I have to discuss FSB, HClock frequencies and such.

First off, this Mobo supports the Northwood chipset so we have to keep that in mind.

Every mobo has a base frequency that it uses to determine all other frequencies used. That frequency is called the HClock, or Host Clock frequency. The default HClock for your Mobo is 200 Mhz. When it comes to the CPU frequency, there is a multiplier involved and for a 2.5 Ghz CPU the default multiplier is 12.5 which gives you 12.5 x 200 Mhz = 2500 Mhz. Now this is fine for the CPU, but other parts of the computer can't run that fast. The PCI bus for example is defaulted at 33Mhz, and the AGP bus runs at 66 Mhz. The memory bus, ( Front Side Bus, FSB), is a little different as depending on the system hardware and system settings, it can either run at the HClock frequency, (Syncronous), or at a different frequency then the HClock, (Asyncronous). Your RAM is all PC3200, 400 Mhz DDR Dram. That means that the actual electronic signal that goes too the DRAM modules is at 200 Mhz, (They call this DDR 400 Mhz because DDR theoretically has the bandwidth of SDRAM running at 400 Mhz, but the actual signal is really just 200 Mhz). Now if you remember, your HClock for your system and your default CPU Frequency are both 200 Mhz as well, so at default settings you would be running your Ram synchronously.

Ok, this is becoming quite a novel, I need a break and will continue on, but pull from this as is, maybe you will discover your problem with what is already here. I would rather teach you to understand and correct your own problems, then correct this one, and possible future ones as well

P.S. Notice those RAM modules listed from newegg have model numbers, they can be vary usefull as they are usually printed on the modules as well

yep ill give u full system specs,
p4 2.5 ghz
1 gb memory kingston
motherboard p4v8x-x
350 watts powersupply
xfx 5900xt ocked 450 core, 950 mem
80 gh hdd

Keep an eye on my previous post as it is being edited because it's so long, and I have so much to say

lol, i understand the lot ive just looked up memory on cpuz and its finds out that one of my memory isnt 3200 its 2700 at 166mhz when i paid for a 3200 (grrrr ) so i had 512 for first slot and then the 2700 on the second and 3200 on the 3rd so thats what happening i think i got to play vietnam to see, w8 5 mins and ill check! ive overclocked to 2.7 ghz too see stay online plz

well it didnt crash it just came out of the game and came back to the desktop ? didnt overheat