PCI-E Frequency OC Testing | DS3 Rev3.3

[Riddlinkidstoner]

After long hours of testing, I can verify that adjusting the PCI-E frequency DOES affect your overclock, specificly with Micron D9 based ram.

Here it goes:

Crucial Ballistix Tracers DDR2-667 5-5-5-15 2.4v (2.2v rated)

PCI-E Freq | Stable FSB (x7)
102 | 430
103 | 430
*Note, 1FSB increase w/o PCI-E increase resulted in errors/restarts/BSODs/coldboot
110 | 440
115 | 460
120 | 500 (currently @ 4hrs Orthos/Memtest stable, still testing.)

G.skill DDR2-800 5-5-5-15 (2GBNQ) 2.3v (2.1v rated)

PCI-E Freq | Stable FSB (x7)
102 | 450
103 | 450
*Note, 1FSB increase w/o PCI-E increase resulted in errors/restarts/BSODs/coldboot
110 | 460
*Note, at this point I reached the max this ram would go.
115 | 470
120 | 470

Although this is limited to two sets of ram, it gives at least something.

YMMV!

 

[allies]

Very interesting... I'm gonna go see if it has any effect on my overclocking... brb

What's the disadvantage to running PCIE freq higher?

 

[Riddlinkidstoner]

I should note that running the PCI-E frequency higher than 120 could result in damaging your video card. Don't think that pushing your PCI-E frequency above 120 is going to remove the wall of your chip

Some people on Xtreme have pushed it to 130+ with success but YMMV.

 

[allies]

Gotchya... I think I'm gonna play around 110 max to see what it does.

 

[FireChicken]

What cpu are u using??

 

[Riddlinkidstoner]

E6300 L631A930

 

[FireChicken]

Very interesting...maybe I will give this a try when I get home

 

[eternitykh]

i think my board only goes up to 104, anyway around that? =(

 

[MDE]

Is this for a specific chipset or Intel only?

 

[eternitykh]

scratch that, stupid me, all i need was to scroll down more..... however

i have found on my computer that
anything above 106 will cause my LAN controller to not function properly
110 caused bluescreen
115 caused bluescreen

but that's for my set up, very interesting tho.

 

[Zambien]

VERY interesting. I have a ds3 3.3 and have the same g.skill ram you do. I'm also hitting a wall around 430ish FSB. I'm going to try this NOW! Back in a second with findings!

p.s. When i set my PCI-E freq to 100 awhile ago, the PC wouldn't boot at all.

 

[PuffDaMagicSamus]

I have the exact same G. SKill RAM as well, too bad I can't hit more than 370 FSB with my e4300. I also can't run it higher than 2.1v without it giving me a "fail" in the BIOS monitor.

 

[Zambien]

YOU ARE MY HERO!

I thought my CPU was limiting my O/C because anytime i went above 445 fsb my pc was erroring, restarting, bsods. Setting my multi to 6, i found out that I was having stability problems even then. Just increasing voltages did not fix the issue, however increasing PCI-E freq does. Here's what I'm running as I type:

multi 6x for testing
480 FSB
117 PCI-E
ram +0.4v
PCI-E +0.1
FSB + 0.2
GMCH + 0.2

I'm gunna go play around some more. I'll post back later!

 

[Riddlinkidstoner]

I'm glad it helped some of you. As far as my testing goes, all I can say is this is for the 965P Intel chipset. Using better ram will net you some better results imo. Be sure to find the highest your ram can go by dropping your multi to x6 and changing the divider to 4:5.

 

[Zambien]

i'm able to load windows at 3.6 now. Not orthos stable, but I think after I lap tomorrow and I play with the settings a bit more it will be. I wasn't able to post past 3.45 before messing with PCI-E. If I'm able to get 3.6 orthos stable tomorrow I'll update this thread with my exact settings.

Thanks!

 

[eternitykh]

so i tested it some more with my setup, i was able to boot into windows stable @ 3.3 with 115pci-e. however, like i mentioned before, anything above 108 pci-e would case my network controller to not function, can anyone shed some light on that?

im just guessing the pci-e trick is board specific on how things would run.

 

[gamephile]

Hey Zambien? Any luck getting your system stable at 3.6? I'm having a heck of a time with mine. I'm stableish ( 4 passes of memtest but it fails Orthos) at 3.31 with my ram at 2:1 (850Mhz) 4-4-4-12. Are you using a fan on your northbridge or ram? I'm nervous about upping my voltages without adequate cooling on everything else.

 

[tersome]

Originally posted by: Riddlinkidstoner
I should note that running the PCI-E frequency higher than 120 could result in damaging your video card. Don't think that pushing your PCI-E frequency above 120 is going to remove the wall of your chip

Some people on Xtreme have pushed it to 130+ with success but YMMV.

I doubt it damages your video card, since nvidia's own linkboost overclocks the PCIe bus to 125mhz. Over 130 or so on some boards results in sata corruption.