Is there any particular reason why people use 101mhz PCI-E bus?

mmj_uk · 31 Aug 2009 at 18:20

Just curious.

PermaBanned · 31 Aug 2009 at 18:33

I'm just saying what everybody's thinking.

Wut?

kitfit1 · 31 Aug 2009 at 18:34

Historically, ATI cards have always seemd to prefer 101mhz going back to the 8500 at least. Not too shure about Nvidia though, as i've only had 2 of thier cards and run both at 100mhz.

Big.Wayne · 31 Aug 2009 at 19:20

mmj_uk said:
Is there any particular reason why people use 101mhz PCI-E bus?

I think its because they copied someone elses BIOS settings

I've heard many years ago there was a problem when running a high FSB that the PCI-E bus didn't lock properly so setting 101MHz worked round this problem on certain boards . . . .

Jokester · 31 Aug 2009 at 19:23

Yeah, way back in the mists of time, setting it to 101MHz instead of 100MHz meant that it became unlinked from the FSB.

kppanic · 31 Aug 2009 at 20:01

Big.Wayne said:
I think its because they copied someone elses BIOS settings

I've heard many years ago there was a problem when running a high FSB that the PCI-E bus didn't lock properly so setting 101MHz worked round this problem on certain boards . . . .

yeah I believe this is the same league of philosophy saying "one notch" above default prevents overvolting.

ps3ud0 · 31 Aug 2009 at 20:16

Yep - main reason why I do it - that was still back in the day where the PCI bus wasnt auto locked to 33Mhz - out of habit now really...

ps3ud0 :cool:

mmj_uk · 31 Aug 2009 at 20:19

So it's done more out of habit now rather than necessity?

.:SAmSuNG:. · 31 Aug 2009 at 20:49

Will help get higher BLCK on some of the X58 boards but will need a lot more than 101.

Gaidin109 · 31 Aug 2009 at 20:51

My bundle was set with 101, but I changed it to 100 when I redid the OC. Is it better at 101 or doesnt it really matter.

rjk · 31 Aug 2009 at 21:04

the settings i use for the crosshair, rampage and UD5 oc bundles at work work with the following...

crosshair3 - 105
rampage - 103
ud5 - 101

the ud5 wont even post at my settings until you set pcie to 101

i have ran 115 on a rampage2 to get 229bclk before though

kitfit1 · 31 Aug 2009 at 21:10

rjkoneill said:
i have ran 115 on a rampage2 to get 229bclk before though

What gfx was that with rjkoneill ?

Gaidin109 · 31 Aug 2009 at 21:47

I don't have any probs with 100 on a ud5. Even with the ocuk bios settings.

.:SAmSuNG:. · 31 Aug 2009 at 21:49

Your hardly pushing the BLCK though. rjkoneill whats the max you have had outa a UD5 without hardmods?

rjk · 31 Aug 2009 at 21:52

max on a ud5 was around 221
max on my current Biostar X58 - 222
max on my rampage was 229

thats the highest i ever had

95thrifles · 31 Aug 2009 at 21:54

sweet

.:SAmSuNG:. · 31 Aug 2009 at 22:03

Can you remember what kinda QPI/VVT and IOH core, PCI-E bus speed you running?

rjk · 31 Aug 2009 at 22:07

all through the roof

i only do those kind of clocks on manufacturer samples or warranty void boards [like my biostar] where it doesnt matter

qpi will have been far into the reds

ioh core never needs that much from my experience

qpi vtt on the rampage was around 1.325

pci bus normally 105
except on the biostar - they like it on auto when bclk above 200

i pushed the rampage to 120 once to see what happend

it didnt work

classified likes high pci bus - rjkoneill doesnt like classified though

Gaidin109 · 31 Aug 2009 at 22:11

will a 101 make a 200x20 OC more stable then, mine seems to be ok for everything except prime95blend.

.:SAmSuNG:. · 31 Aug 2009 at 22:20

So QPI PLL effects high BLCK?