[MiseryQ]

Hypothetically,,,

My computer is overclocked...
The FSB is at 152mhz...
So this alone over clocks the AGP FSB correct?!?

So now I overclock the card itself to 225,,, up from 175... And 470,,, up from 400...

How much of an overclock is this really?!?

If the boards FSB were lower could the card be OCd more?!?

Just trying to understand the cause and effect of it all...

[SeigeAkicksass]

now i could be horribly wrong so if i am some 1 plz correct me, but i woudl think that this would not be more of an overclock than jsut doing the video card although it may run faster, i think when you over clock the AGP it just allows it to tranfer things faster wich may jsut allow you to overclock the vidoe card with more efficiency ( as in you wont max out the AGP's data tranfer capability) so the overclocking after a ceritain point- wich may not be so high that is dosnt matter- will actually do stuff but i think i could definatly be horribly wrong so plz some 1 correct me . that is jsut my thery

[MiseryQ]

Ok,,,

If raising the AGP fsb increases the tranfer rate then it is basically increasing the bandwidth... So that does make some sense... That could help the OCd card communcate with the board faster...

But does AGP fsb have any effect on the cards speed itself?!? It seems like it should...

[SeigeAkicksass]

like i said i coudl be wrong that was jsut a thought but it woudl be nice to know... im not sure it may effect the speed

[Roman79]

The AGP bus runs at a certain speed, can't remember the exact number, but it's a quotent of your FSB and and another number.

It's the same as the PCI bus. This runs at 33MHz normally. This number comes from taking the FSB and dividing it by 4 (assuming your FSB is 133). So....

133/4 = 33MHz

If you overclock your FSB to 140, then you get this:

140/4 = 35MHz

So if you have a PCI card that won't run at 35MHz......then your computer probably either won't boot, or it will lock up when it gets to windows

The AGP bus works the same way, you overclock your FSB, you're overclocking your AGP bus as well. If your card doesn't like the higher bus speed, then it may complain. I think you would notice this effect whether you overclocked you vid card or not.

In other words, I don't think a higher FSB speed would cause your vid card to not reach it's full potential

[DaddyB]

thats right and the agp bus runs at 66mhz default (double pci) so when the fsb is 140, the pci is 35 and the agp bus is 70 and so on. the agp is always double the pci.

[Roman79]

Always double the PCI bus? Good, I'll have to remember that.

[Check-X]

So I guess if you are having issues with OC'ing maybe try pulling all your sound/network cards etc and trying again.. theoreticly your best OC'ing should be with JUST a good AGP vid card in it (for less chance of PCI bus speed confilts).

More on PCI/AGP slot speed issues.. is there a way to check max bus speeds other than tedious trial and error? Also.. are there ways to overclock other computer components such as sound cards/network cards/controllercards ? if so would there be any noticable performance gain in ANY areas?

[Illah]

Upping the FSB really does help the video card. If you don't believe me put the card at stock speeds and do the same with the FSB (133). Run 3dmark. Then, up the FSB to whatever and run 3dmark again, you'll see an improvement.

So if you're asking what your overclock really is I couldn't tell you. There's no formula of FSB-Core-Memory relations too see how much you overclocked it. About all you can do is run 3dmark with the FSB, CPU, and vid card all at stock, then overclock everything as far as you can then compare 3dmark scores. If you started at 6000 with everthing stock and then upped the FSB, CPU and vid card and ended up with 8000, then you got yourself a 33.3% speed increase over stock.

--Illah

[MiseryQ]

This was a hypothetical question... I thought of it while putting my new card in...

But now I'm REALLY interested,,, Illah I'm gonna run two tests now and edit the results in...

-edit- I planned to do this and am running 3dMark now... But there's one problem,,, My chip is still locked and changing the FSB will also change the CPU speed by over 200mhz... That alone will cause a performance boost,,, I guess I'll have to wait until I unlock my CPU...

@133: 7046 @800x600x32,,, My gaming resolution...
@152: 7766 @same...

[o770]

unless you have the agp interface set to 2x (or even 1x) youre not gonna get much of improvement - i beleive. thats because although the bandwidth increases, video card/mainboard/chipset still will not use all of it. 4X isnt all used yet.
so theorically increasing the bandwidth should improve performance but thats not gonna happen really, as we should think it would. you can also make a test in order to verify this: check the performance difference between the agp interface set to 2X and 4X. youll notice the difference is not great (as it should be), what means all the bandwidth available is not used by the system.

[Tracert]

Correct me if I am wrong but I thought the original question was if you raise the FSB does that increase the GPU speed also?

Example... 200 / 200 @ a fsb of 66 mhz AGP, so raising the AGP bus speed to lets say 70 Mhz would give you 210 / 210.

If this is what you were asking then I believe the answer is no.

By raising the AGP bus speed you are not increasing the overclock on the GPU or the Memory of the Card. It is not related like it is for the CPU.

they are two different things run by their own clock. However by raising the bus speed of the AGP you do increase bandwidth as mentioned above. Also an increase in AGP Bus speed will cause unstable opperation if it cannot handle the speed so far out of spec.

[SeigeAkicksass]

o was thinking wat otto was saying i dont think it woudl make the card go faster jsut be able toif it could send stuff that fast but as i said im not usre


and if you test that try to raise your FSB enough so that if u drop the multipyer on ur CPU then it will be that same so you have as close to the same testing conitions as u can get, you dont have top bu it may show whether thaere is a diff. more effectivly

[Penguin4x4]

It would increase bandwidth. I know that PCI runs at 32bit/33MHz, or 133Mbp/s, and the max is (I think)40MHz, so that would run at 160Mbp/s. The AGP is 66MHz, and I think 64 bit. Right? 528Mbp/s, no thats not right, is it?

[MiseryQ]

I guess that was the original question,,, But this is better...

So increasing the boards FSB increases the bandwidth of data to and from the card only,,, Nothing else?!?

Can raising the Boards FSB have any damaging effects on the AGP or PCI devices?!?

[MiseryQ]

I just disabled 4X in the bios and ran 3dMarkSE once again... The score is 7729...

I'm going to run the test at 133mhz and see it 4X inprovement is the same...


-edit-

@133mhz: 6964...

.oo5%(152mhz) compared to .o12%(133mhz)
Why would the increase be greater for 133mhz?!?
2xAGPScore/(4xAGPscore-4xAGPScore)=increase% Correct?!?