Overclocking Brick Wall - Suggestions

walkeral

Junior Member
Apr 1, 2005
12
0
0
After finally getting hold of some new parts, I've got my new X2 3800 system running. Specs are:

Athlon X2 3800+ (2.00GHz)
MSI K8N SLI mobo (NF4 SLI), BIOS v1.3
1x1GB Crucial Ballistix PC4000 (rated 3-4-4-10@2.8V to 250MHz) - yes I know I'm not running dual channel, but I'm intending to run this system at 2GB in the near future and I want some room for expansion later.
Samsung SP2004C 200GB SATA drive, installed on port 1.
Gigabyte 6600GT graphics.

I've been experimenting with overclocking (as my old PC is an old KT133 with only the FSB and the CAS latency to change!) and I've seemingly hit a wall at 235MHz.

I'm currently running at 2-2-2-5 1T, RAM on 2.8V, CPU on 1.40V 10x (2.35GHz), NF4 at stock voltage, HTT at 4x (giving 940MHz, so below the 1GHz mark), and with the PCIE locked at 100MHz. There is no PCI lock that I can see, but SiSoft tells me it's on the same divider, so it should be running at 33MHz.

I jumped to 240MHz. Black screen - had to clear the CMOS to get it going again. Tried 236MHz - won't boot. I'll jump straight to the point: After changing various options one at a time, I ended up with the RAM at 3-4-4-8 2T @2.85V, CPU ratio at 8x to ensure it's not the problem, still running at 1.40V as that's the board's maximum, NF4 overvolted by 0.1V, and yet I still can't get the FSB above 235MHz.

Having read numerous guides, I find it odd that it goes from fastest near-normal settings and working fine, to overvolting everything and underclocking everything except the RAM and not working within 1MHz!

There are about 15 memory settings in the BIOS on this board, some I can't even find reference to on the internet. Changing these had no effect either. I also found that the "Aggressive Memory Timings" option messed everything up at about 205MHz, so that's been killed as well. I'm seemingly running out of options. Am I missing something here?
 

NateSLC

Senior member
Feb 28, 2001
943
0
0
I have the same board and CPU. I'm running at 250 with value ram and a mem divider. I'll let you know my settings when I get home in a few hours.
 

NateSLC

Senior member
Feb 28, 2001
943
0
0
Here's what I know off the top of my head:

CPU 2500Mhz
HTT 4x (1000Mhz)
RAM 166 (208Mhz) loose timings at 1t

Default voltages across the board
 

Wentelteefje

Golden Member
Dec 6, 2005
1,380
0
0
Installed SATA drive on the wrong port mate... If it is controlled by the Silicon Image Controller, then you can forget about it going any higher than 235MHz... Normally ports 3 and 4 are controlled by the nForce4 chipset, and that one doesn't crap out so soon... Switch ports, really...
 

walkeral

Junior Member
Apr 1, 2005
12
0
0
I'll give that a try then. I don't believe that this board has the Silicon Image controller though...
 

Wentelteefje

Golden Member
Dec 6, 2005
1,380
0
0
Hmm, you appear to be right... I knew the nForce4 Ultra had this problem because of the SIC, but it might be your problem solver too...

Otherwise, try dividing your RAM to ensure that it's not the limiting factor here... What PSU do you have?

EDIT: Overclockers New Zealand have problems getting higher than 254MHz on the K8N-SLI Platinum with a SATA drive... That's the reason why I stayed with my trusty ATA133 Maxtor...
 

walkeral

Junior Member
Apr 1, 2005
12
0
0
PSU is an Antec NeoHE 430. I've heard of a few problems with these, but after stress testing on the current settings with Prime95 / 3DMark / copying files over the network at the same time, it seems perfectly stable.

I've also got all three PSU connections to the board installed (ATX24 / ATX12V / Extra molex).

I'm packing up to go back to uni this morning, so it might be this evening before I check the SATA problem.
 

walkeral

Junior Member
Apr 1, 2005
12
0
0
Just got the chance to try again (nForce IDE drivers were causing hangs at the windows logo). Got to 240MHz with an HT of 1x. Tried 2.5 and it's the black screen again. Yet it works on 4x at 235...
 
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