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A Q about V5, its overclocking, 2/3 Agp and high fsb

M

MadAd

Senior member

Question - the V5 uses the AGP, but isnt an agp card so i hear ... sooo does that mean if I my fsb is into the 120-130's and only a 2/3 divider on my BX6-2 that im overclocking the V5 quite a bit already?

Id like to calculate the current speed before o/cing with the V5 slider, but dont know wether to use the pci or agp speeds, since its only a jumped up pci card operating in an agp slot (so im told)

can someone clarify plz?? thanks
 
as long as you have a good power supply, and a mobo that can adjust I/O voltage, you should be fine.

Understand that AGP overclocking and video core/memory overclocking are 2 different animals.

whatever your FSB is, multiply that by 2/3 to get your AGP speed. Even if it's only a "PCI" card.

Oh, and make sure your BIOS reads "2/3" for the AGP multiplier. Hate to see the 5500 @ 133 MHz AGP, heh....
 
I ran into the "double overclocking" issue with my Voodoo 3 3K. Mine had the 5.5ns memory, so I ran it @ 183 MHz on my BX 100 FSB/66 AGP setup perfectly fine. Then I went to a BX 133 FSB/89 AGP setup. It worked, but I'd get frequent lockups. I backed the V3 speed down to 178, and it was perfect again. I'm not sure if a V5 will behave the same way. You may have to do a little fine tuning.
 
I have a p3 700@938 (134 mhz fsb, 89.3 agp speed) and a voodoo3@195 mhz.
I dont get any lockups at all, even after a whole night of UT ( its 3 am here now and i am going to start playing again 🙂 ). I lapped the V3, flashed the bios of the v3, put on a heavy duty fan that cools the ram sinks as well. I havent had a single lockup. I think you should be fine at that agp speed. I do get lockups at fsb more than 140 (agp 93 mhz), but i cant run UT at more than 134 mhz fsb. Doesnt want to start 🙁
 
What was strange was Quake 2 was the ONLY game that locked up. This would happen within 2 minutes. Nothing else did. Backed down to 178, didn't happen. Mine was all stock cooling though. As usual, YMMV.
 
Lap it, and at least get a fan for it. Now mine is stable at 198 mhz, in quake3, UT, NFS porsche etc. I get fragments on the screen if i go for 200, but still no lockups.
You can flash it as well. go here:
Voodoo3 flashing.
 
thanks for the replies, im familiar with CPU overclocking, and o/c'ed my V2s no probs, and am gonna o/c it till it wobbles anyway 🙂

But the v5 being an agp card, and the fact it doesnt use agp somehow made me wonder exactly what was running at what bus speed, and why.

can anyone give us a tech explanation please?
 
AGP speed is tied to memory speed, it will always be some ratio.

The motherboard you have has a BX chipset. The BX chipset has 2 options for AGP speed:

1) Equal to the memory speed
2) 2/3 of the memory speed

In other words, if you have your memory speed (front side bus) set at 100 MHz, then your AGP speed would be either 100 MHz or 66 MHz, depending upon if it is 1:1 or 2:3 ratio.

If your FSB is 133, then you are @ 2/3 of 133, or 89 MHz
 
it's interesting to note that the Voodoo 3 takes advantage of all AGP 2x features except AGP texturing (and probably a few that I don't know about), however the V5 can't, becuase in order to run Dual chips on the one card, they had to do some tricky work. They could not run the Voodoo 5 in AGP 2x, mode, rather it runs as if it was a 66mhz PCI bus.

what this means is that when playing games that aren't dependant on the video card, the limitation will either be the interface (using AGP as a PCI66), or the CPU, whereas when the Voodoo 3 isn't being the limitation in a game, it is most likely the CPU (it can be the bus as well, but it's alot less likely).

What this all boils down to is this, the higher your FSB goes, the higher mhz your AGP port runs at. The Voodoo 5 would benefit from that, but you would only see the performance increase when the card isn't the limit..
 
excellent replies guys, im well aware my pysical agp is o/c'ed well out of spec at 133, which is partly why im asking these questions

but still it doesnt answer my question about the V5 .... is it running at 66 or 33? I have some confusion since altho its poking out my agp slot, I hear it doesnt use agp, and infact its a pci of sorts.

So whats the deal there? Is it a 66mhz pci card? or a 33 that just happens to use the agp slot? And how do we know?

hope thats a bit clearer ... thanks again everyone.
 
it is at 66 mhz bus speed, but when the fsb is overclocked to 133 mhz, and with the agp divider at 2/3, you have your V5 at 89 mhz bus speed.
 
it is an agp card but does not take advantage of many of the features of the agp....like texturing and agp fast writes..etc
 
brillant, thanks guys, so its deffo talking on the agp bus at 66> mhz and not 33 ... next question was/is whats the relationship between overclocking the card memory and agp operation??? Is it a straight trade up/down mhz for mhz??
 
Then you can leave agp aperture size at the minimum in the bios (i have mine at 4) since it doesnt use that anyways.
I am not sure about the relation with higher agp speeds in relation to higher fillrate etc etc with the Voodoos, since they dont use that memory anyways.

When it comes to my V3 3000, i have it at 90 mhz agp bus speed, and overclocked to 196.
I realized that it wasnt the agp speed holding the V3 back from higher overclocks, but just the capability of the V3 was held back by developing too much heat. After lapping and putting a heavy duty fan on, i could overclock even higher. The high agp bus speed didnt seem to matter at all.
 
MadAd, it is PCI66. i.e. never @ 33 MHz. The AGP slot is a 66 MHz slot. Unless you get the PCI card and plug it into a PCI slot, you won't run @ 33 MHz ever.

"whats the relationship between overclocking the card memory and agp operation"

unknown and varies. doesn't make a difference sometimes, does make a difference other times.

typically, however, higher AGP speeds require higher I/O for the 5500 to work well.
 
I have a V5 and I can tell you right now that it DOESN'T like a 133 FSB (89 AGP)! My PIII650 runs flawlessly at 865 with my Voodoo3 3000 but my freakin' V5 doesn't like much more than 66MHz AGP speed! :| Oh and for any of you wondering, my default IO voltage is set to 3.5 (instead of 3.3 where it should be). I think I'm going to have to get a i815 board or a Radeon VIVO. 😉
 
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