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Overclocking Problem


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#41
spreadie

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This definitely must be a problem with the -VM model, since I have the P5LD2, and I dont have any of these problems. I set my FSB to 180, didnt touch the Vcore, and boom, 3.6Ghz just like that...


Rumours abound that Asus used lower quality clock gens on the VM boards.

<_<

#42
ScR34m

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@spreadie

Thanx.... probably error found to mine. The powersupply seems to be.

Your settings are working till a fsb of 159.

Sometimes it boots with 160 and works 2 days without a problem (prime stable) till i make a reboot. After this is nothing to see. (POST)

#43
spreadie

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What are your Voltage rails reading? And what about CPU & MB temps?

I'm using a 375watt PSU but it does have twin 12v rails.

@159mhz you should be ok with 1:1 DRAM:FSB ratio but you could try lowering the ratio and see if it boots at a higher FSB.

You CAN go further with the PCIe safely, but I would use the onboard grfx for testing. I got mine to run @ 190mhz FSB - 3.8Ghz using PCIe 125 but I had to replace the small heatsink on the chipset and add a 40mm fan to keep the temps down.

But even then it failed prime after 30 minutes or so. Had to settle for 3.6ghz to get it fully stable.

If you are using an old case, cut a blowhole in the top and fit an extracting fan. It helps keep the PSU temp down as well as overall system temp.

#44
cucamelsmd15

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What are your Voltage rails reading? And what about CPU & MB temps?

I'm using a 375watt PSU but it does have twin 12v rails.

@159mhz you should be ok with 1:1 DRAM:FSB ratio but you could try lowering the ratio and see if it boots at a higher FSB.

You CAN go further with the PCIe safely, but I would use the onboard grfx for testing. I got mine to run @ 190mhz FSB - 3.8Ghz using PCIe 125 but I had to replace the small heatsink on the chipset and add a 40mm fan to keep the temps down.

But even then it failed prime after 30 minutes or so. Had to settle for 3.6ghz to get it fully stable.

If you are using an old case, cut a blowhole in the top and fit an extracting fan. It helps keep the PSU temp down as well as overall system temp.


Twin 12v is a definite no-no with the 805. You want a single rail, with good amperage. I think that might explain why youre unstable at 3.8Ghz. Ive got mine running 4.0Ghz on air right now.

Also, upping the PCI-e bus frequency does nothing for framerates or graphics performance. You really need to lock it at 100 (the default), and also lock the PCI at 33.3 when you start overclocking with the P5LD2 boards. At 125, youre really running the risk of frying the graphics card :police:

#45
ScR34m

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@spreadie
Sorry but i dont realy know what you mean....

Here are 2 Screenshots (1. of my Jumperfree Setting 2.PSU and Temp)
What you mean i have to change?!?

Posted Image
Posted Image

#46
cucamelsmd15

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@spreadie
Sorry but i dont realy know what you mean....

Here are 2 Screenshots (1. of my Jumperfree Setting 2.PSU and Temp)
What you mean i have to change?!?

Posted Image
Posted Image


Dude, your MoBo is cooking, might want to get some fans on that ASAP

#47
ScR34m

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Ok, now i have installed a big fan infront of the mobo.

Normaly the Mobo temp is about 41C (is it normaly? )

What can i try to see if there's a litle bit more possible?

here are 2 actual pics:

Posted Image

Posted Image

Posted Image

#48
cucamelsmd15

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Ok, now i have installed a big fan infront of the mobo.

Normaly the Mobo temp is about 41C (is it normaly? )

What can i try to see if there's a litle bit more possible?

here are 2 actual pics:

Posted Image

Posted Image

Posted Image


Thats better. My MoBo is sitting at 34C right now.

#49
ScR34m

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and what can i do to make it faster :D

#50
cucamelsmd15

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and what can i do to make it faster :D


Well, the short of it is, if you cant go over 159, you simply cant. Youve hit the limit of that chip.

Aside from that bit, the -VM apparently isnt quite up to spec of the P5LD2, since alot of people are having this problem with the -VM board. Also, it could be your memory thats holding you back as well. Theres lots of variables that go into a good overclock, so much so that I think its more of an art than a science.

#51
dubhead

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I received my Asus P5LD2-V today ..now waiting for the CPU then i can tell how that Combo turns out.
But according to the Asus Site it seems the -VM is not the right choice(for OC'ing).

Can someone tell me whats the diff from the 945G and the 945P?


PS..sorry if thats a numb question iam actually a Maccie user so not to familiar with PC HW :(

#52
spreadie

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Twin 12v is a definite no-no with the 805. You want a single rail, with good amperage. I think that might explain why youre unstable at 3.8Ghz. Ive got mine running 4.0Ghz on air right now.

Also, upping the PCI-e bus frequency does nothing for framerates or graphics performance. You really need to lock it at 100 (the default), and also lock the PCI at 33.3 when you start overclocking with the P5LD2 boards. At 125, youre really running the risk of frying the graphics card :(


How do you figure a twin 12v rail PSU is no good for a dual core CPU? PSU manufacturers have been pushing toward multiple rail units for some time now and dual core CPUs are more common than ever.

I have a good 450w PSU with a high amp single rail - it made absolutely no difference to my overclock, thats why I'm using the 375. The 450 is in my gaming rig. I use the 805 for experimentation and video encoding. Incidentally, I dont run it at 125 PCIe, I did that to see how far it would go. PCIe is currently 119mhz @3.6ghz. Its more than likely I've reached the limits of this mobo or CPU.

BTW Cucamel, there is a bug on the VM board - you have to raise the PCIe to get a decent overclock.

I bought the 805 just to see what it can do - will prolly buy another with a different mobo - the full fat P5LD2 looks like a decent candidate. With the CPU costing less than 100, its hardly the end of the world if I kill it. But I wouldnt suggest other people push it too far - Thats why I suggested scr34m should use the onboard gfx for testing.

I do agree with you about Scr34ms temps, they are way too high, even after he fitted the case fan.
[edit] I would expect those temps at full load.

My CPU and mobo temps are 34 and 28 degrees. I have 3 x 80mm case fans and one 120mm. I use a freezer pro on the cpu and 40mm fan on a large heatsink on the southbridge. I also use a heat terminator for blowing air across the RAM. Used a couple of Zalman fan wires to reduce the fan speeds and noise.

Scr34m, I would look at replacing the southbridge heatsink with a bigger, actively cooled HSF, also check the air temp at the top of your case after running the system for a while - see if its warm. You NEED good airflow in ur case if you want to overclock.

ttfn :D

#53
baysie

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Why would you want to overclock your PC ? you have a fairly good spec,

My advice buy a faster processor,

#54
spreadie

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Why would you want to overclock your PC ? you have a fairly good spec,

My advice buy a faster processor,


Well the 805 costs less than 100. Spend 30-40 on cooling and it will run like a D960 which costs about 360.

But, money matters aside, its FUN!!

#55
spreadie

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I received my Asus P5LD2-V today ..now waiting for the CPU then i can tell how that Combo turns out.
But according to the Asus Site it seems the -VM is not the right choice(for OC'ing).

Can someone tell me whats the diff from the 945G and the 945P?
PS..sorry if thats a numb question iam actually a Maccie user so not to familiar with PC HW :(


The 945G incorporates Intel onboard graphics.

#56
cucamelsmd15

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How do you figure a twin 12v rail PSU is no good for a dual core CPU? PSU manufacturers have been pushing toward multiple rail units for some time now and dual core CPUs are more common than ever.

I have a good 450w PSU with a high amp single rail - it made absolutely no difference to my overclock, thats why I'm using the 375. The 450 is in my gaming rig. I use the 805 for experimentation and video encoding. Incidentally, I dont run it at 125 PCIe, I did that to see how far it would go. PCIe is currently 119mhz @3.6ghz. Its more than likely I've reached the limits of this mobo or CPU.

BTW Cucamel, there is a bug on the VM board - you have to raise the PCIe to get a decent overclock.

I bought the 805 just to see what it can do - will prolly buy another with a different mobo - the full fat P5LD2 looks like a decent candidate. With the CPU costing less than 100, its hardly the end of the world if I kill it. But I wouldnt suggest other people push it too far - Thats why I suggested scr34m should use the onboard gfx for testing.

I do agree with you about Scr34ms temps, they are way too high, even after he fitted the case fan.
[edit] I would expect those temps at full load.

My CPU and mobo temps are 34 and 28 degrees. I have 3 x 80mm case fans and one 120mm. I use a freezer pro on the cpu and 40mm fan on a large heatsink on the southbridge. I also use a heat terminator for blowing air across the RAM. Used a couple of Zalman fan wires to reduce the fan speeds and noise.

Scr34m, I would look at replacing the southbridge heatsink with a bigger, actively cooled HSF, also check the air temp at the top of your case after running the system for a while - see if its warm. You NEED good airflow in ur case if you want to overclock.

ttfn :wallbash:


Ill refer you to this on the single vs. dual issue
http://www.ocforums....ad.php?t=391777

To summarize, its better to have all the power on one rail, rather than two, especially when overclocking. Its no secret that an overclocked 805 is extremely power hungry. The general opinion around the PC enthusiast community is single with higher amps is better, and Ive found this to be my experience as well. If youre running a 375W at 3.6Ghz, Id imagine that youre pushing the limits of that PSU pretty well. Ive got a 550W, and its pretty taxing at 3.6, worse at 3.8, and extremely bad at 4.0.

As far as the bug on the -VM board, that would make me extremely uneasy if I had a GPU plugged into that slot. It would make me uneasy anyway :withstupid:

As far as temps, this is a Smithfield based core, and its no secret (again) that they double as great space heaters :whistle: At 4.0 with my Zalman, I idle at 42, and hit load at 60 (and its dropping because my AS5 is still being broken in...). Half of the reason is because I have a full ATX case with great airflow (and noise obviously, but thats not a deal breaker). My MoBo as I type this is 32, with an ambient temp of 25C. Here again, good airflow is of great proportion to your ability to overclock successfully. :dev:

#57
ScR34m

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Hi,
my 805 on P5LD2-VM DH just working on 166 FSB and this absolutly Prime Stable.
My error was that i forget to set the memory voltage a little higher.

Here`s my Setting:
CPU Frequency: 166
DRAM Frequency: 332
PCI Express Frequency: 118
PCI Clock: fixed to 33,3
Memory Voltage: 1,85
vCore: 1,3275

The temps are: Idle: 40-41
Prime and other benchmarks: 49-51

#58
dubhead

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Hello..back with some expirience here with the P5LD2-V and the D 805. Iam abit asstonished about it..since i cant get higher bootable overclock as 3.18ghz and a FSB of 159. :D

I made another Test with my older P4 521 Preler CPU that comes with a FSB 800 and i can clock this one stable at 3.8 GHZ with FSB 270 and higher.

System Information
Geekbench Version: Geekbench 2006 (build 180)
Geekbench Platform: Mac OS X x86
Geekbench Compiler: GCC 4.0.1 (Apple Computer, Inc. build 5341)
OS: Mac OS X 10.4.5 (Build 8G1454)
Model: Developer Transition Kit
Motherboard: ADP2,1
Processor: Intel® Pentium® 4 CPU 2.80GHz
Processor ID: GenuineIntel Family 15 Model 4 Stepping 1
Logical Processor Count: 2
Physical Processor Count: 1
Processor Frequency: 3730 MHz
Bus Frequency: 1064 MHz
Memory: 1024 MB


Geekbench Result:195.1


Think i sell the D 805 and go for a D 930...sign





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