Higher PCI-E bus frequency = Higher OC?

[MaxAwesome]

Hey guys;

Currently I have my Asus 8800GT @ Core: 700mhz; Shader: 1705mhz; Mem: 1030mhz(2060mhz effective). You all know 8800gt stock speeds, and I cant say it's a bad OC at all. This brings my 3dmark 06 score up from 11k to 13k(almost 14k actually). That's breaking into 9800GTX+ territory right there.

This is as far as the card will go while being stable, apparently. At least @ stock voltages. I don't really know how to increase my GPU voltage, and I don't think I have the know-how to do it without breaking it Is there an "easy" way to do it?


Apart from that, I would like to know something. Would increasing the PCI-e bus in the BIOS help with a higher OC?

I keep the PCI-e bus @ the normal 100mhz, but would pushing it to 105 or so help in any way?

Basic PC specs:

Asus P5Q Pro

E8400 @ stock (no need to OC yet)

ASUS 8800GT Glaciator

4GB RAM DDR2 800mhz - Transcend

 

[niko084]

Changing the bus speed only increases throughput of the port, needless to say this isn't needed with any current card, unless you are stuck in a 8x/8x sli or 16x/4x crossfire setup.

 

[Cold Storm]

Increasing your PCI-e bus will help on ocing of the card. That is true. But, I would never oc higher then 115.. If you move higher then that, it's more of you risking blowing the Irq's of the board, along with the card itself.

 

[niko084]

Increasing your PCI-e bus will help on ocing of the card.

How would you figure?

You clock the GPU and Ram on your video card...
It's limited by the memories ability, your cooling and voltage.

 

[eidairaman1]

if i was you i wouldnt raise it more than 5 MHZ at the most but start at 1 MHz if its setup that way.

 

[MaxAwesome]

Well, since OC increases the output of a GPU, would increasing PCI-e bus speed help it keeping up with the higher GPU output? Or make it more stable at higher mhz?

 

[MaxAwesome]

if i was you i wouldnt raise it more than 5 MHZ at the most but start at 1 MHz if its setup that way.

Yep, the P5Q Pro allows 1mhz increments It's a great board.

 

[niko084]

Well, since OC increases the output of a GPU, would increasing PCI-e bus speed help it keeping up with the higher GPU output? Or make it more stable at higher mhz?

Increasing the freq of the port increases the total throughput, currently we don't have any cards that will use even PCI-E x16 v1.0 full throughput, so saying that, it's useless...

Now like I said if you had a card stuck in x4 or x8 mode, then I can see it making a difference in your performance, but "not" to the point it's going to help your overclock at all.

We also had threads concerning this a long time ago, and everyone testing randomly back and forth couldn't come up with any evidence that it improved performance.

That's like saying adding 3 more lanes to your drag strip will make your car go faster.....

 

[MaxAwesome]

Increasing the freq of the port increases the total throughput, currently we don't have any cards that will use even PCI-E x16 v1.0 full throughput, so saying that, it's useless...

Now like I said if you had a card stuck in x4 or x8 mode, then I can see it making a difference in your performance, but "not" to the point it's going to help your overclock at all.

We also had threads concerning this a long time ago, and everyone testing randomly back and forth couldn't come up with any evidence that it improved performance.

That's like saying adding 3 more lanes to your drag strip will make your car go faster.....

That makes sense. And since my Mobo is PCI-E 2.0, it's far from being bottlenecked.

That being said... I would like to push my GPU a little farther... But volt mods are not my kind of thing I would do it if I knew how to, but I have zero knowledge about electrical components/electicity in general. And I mean ZERO

 

[niko084]

That makes sense. And since my Mobo is PCI-E 2.0, it's far from being bottlenecked.

That being said... I would like to push my GPU a little farther... But volt mods are not my kind of thing I would do it if I knew how to, but I have zero knowledge about electrical components/electicity in general. And I mean ZERO

Better off not messing with it then on a board modification level.

Now a bit of bios flashing maybe another idea. Not sure what you can do with an 8800GT though.

 

[Cold Storm]

How would you figure?

You clock the GPU and Ram on your video card...
It's limited by the memories ability, your cooling and voltage.

reason I say that is raising the PCi-e bus helps the stability of the card when your going to oc the card to it's limits.. Your right on the factor, but it does show that it can help the stability of the card.

 

[EastCoasthandle]

That is going to depend on the video card and PC (motherboard, ram, CPU, OS settings, etc) used. There really is no set guide and there is no guarantee that you will see an improvement in performance. As suggested, if you do experiment with this use increments of 1 and, IMO don't go no higher then 110.

 

[niko084]

reason I say that is raising the PCi-e bus helps the stability of the card when your going to oc the card to it's limits.. Your right on the factor, but it does show that it can help the stability of the card.

I have heard people say that, but never any hard evidence from a pro overclocker.
Never seen a difference myself.'

And to top it off, it simply doesn't make sense.

 

[Cold Storm]

I've played with the bus with every card I've owned so far. with this Gtx, I can get the cards stable 24/7 when I run the bus a 110. On clocks a little lower then what I bench with.. But, To me, I don't see the reasoning to have the cards oc'ed only at benching..

There is a reason why most board makers lock that factor... It can ether burn the board, or go and take both the board and card.. Threw Irq's.. And Irq's isn't something you really want to mess with..

Eastcoast is right.. It just all depends on the set-up, and how the person is at testing over and over to make sure your not going to hurt anything..

 

[eidairaman1]

its only really for stability troubleshooting, because sometimes some cards dont run at the exact bus freq but higher etc.

 

[MilkyWay]

it can ruin stability if you change the pci ex frequency, at least that what i was told for my motherboard

 

[HammerON]

Increasing the freq of the port increases the total throughput, currently we don't have any cards that will use even PCI-E x16 v1.0 full throughput, so saying that, it's useless...

Now like I said if you had a card stuck in x4 or x8 mode, then I can see it making a difference in your performance, but "not" to the point it's going to help your overclock at all.

We also had threads concerning this a long time ago, and everyone testing randomly back and forth couldn't come up with any evidence that it improved performance.

That's like saying adding 3 more lanes to your drag strip will make your car go faster.....

This has always confused me (that is not difficult to do) ~ whether or not to increase the PCI-Express Bus Frequency in the BIOS when overclocking my system, so thanks for some clarification.

 

[sneekypeet]

Actually fellas depending on the GPU, W1zzard showed that overclocking the PCI bus actually increased the speed of the card automatically. Be careful as if you have already OC'd a 9series or GTX200 card the bus will overclock the card more.