Dividers?

[joek71]

Hi guys, I am trying to mod my bios for kg7-r, i would like to know what dividers i can try to set, what dividers does bd7 have? Can I set 5:4:1 or something like that? My current are 4:4:1 or 3:3:1, want to change them. please comment.

Thanks,
Joe

[dicki]

ugh... first... can you steady up on the double posts? it's really hard to follow

okay a quick guide to pci dividers

in a normal old school computer you'd have a pci bus speed of 100mhz a memory speed of 100mhz a pci speed of 33mhz(1/3) and an agp speed of 66mhz(2/3) this is using the 3 pci divider and is called in your notation 3:3:1

computers then moved up to asyncronus 133 memory so you ended up with a bus speed of 100mhz, a pci speed of 33mhz and a memory speed of 133mhz (100+33)

then everything moved up to a syncronus 133mhz
133mhz cpu, 133mhz memory, 33mhz(1/4) pci and 66mhz(1/2) agp this uses the 4 divider and is in your notation 4:4:1 (133/4 = 33mhz)

the PLL on your motherboard will offer a host of different settings with dividers up to 6 and fsb speeds in excess of 200mhz however motherboard manufacturers do not often connect the nessacery wires to give you access to these extreme settings, and in the kg7 i beleive the only option available is for a divider of 4.

your other question related to this was what bus speeds would an fsb of 160 give you

160/4 = 40
160/2 = 80

so your cpu will be at 160*10=1660 (as you said)
the memory will be at 160
the agp will be at 80
the pci will be at 40

personally my feelings about higher dividers are that you should leave them alone... it might be able to give you a higher technical overclock but the bandwidth of the system (the amount of data that can be shoved around) will be severly limited by the slower systems when the divider kicks in and you'll end up with a slower computer

dicki

[joek71]

So how will that look? 6:6:1 or 5:5:1or can I make it like this 5:5:2 or 5:5:3?Is there anywhere I can read on how to connect those wires to get higher dividers?

[Player0]

Your only options for dividers are already in your BIOS.

[joek71]

Lets say I wanted to mod the bios, and I would like to set it at 5:5:1 or 6:6:1 or 5:5:2 etc.... and my fsb would be 160*10=1600,
where would 5:5:1 be divided into 160 0r 1600, example:
lets say my setting are 5:5:1 and fsb 160 mult is 10, would 5 be divided into 160 or 1600, that what I am trying to figure out.

Thanks,
Joe

[Player0]

You cant modify the bios to do this. Dividers are limited by the chipset itself.

I dont understand the rest of your post.

[joek71]

I would like to try to set different dividers, will experiment see what happens. My question is for example 4:4:1 does it get divided into 160fsb or in to 1600mhz, thats my question. I have another question, what kind of dividers are out there on abit mobo, examples : 5:5:1,6:6:1 etx..., please specify.

Thanks,
Joe

[NorthernYankee]

The dividers go into the FSB to get your PCI and AGP speeds. The only boards that support the 1/5 are KT333 boards and ALi boards and the only board with 1/6 is the XP333 you cannot go into a BIOS and twek dividers if they are not there.

And you cannot do 5:5:1 or 4:4:1 because that means AGP is out of spec. The number associate to FSB:AGP:PCI I hope this claryifys it for you

--NY

[joek71]

My Kg7-r supports 4:4:1, cna I try 5:4:1, these dividers do they get divided into the fsb160 or into the 1600mhz??

[dicki]

hi joek,

it looks like i caused more confusion! if you do the maths you will see that it can only possibly be divided into 160

e.g.

1600 / 4 = would give a pci bus speed of 400mhz

a agp speed of 800mhz

and a memory speed of 1600mhz

-----------------------------------

160 / 4 = 40

agp = 80

memory = 160

-----------------------------------

as has allready been said by myself and the others the KG7 does not have the option for a divider greater than 4

the componants that go into the KG7 may be able to do it but the KG7 as a board cannot

as for connecting up the wires to do it that would involve modifying a multilayer pcb by hand...

dicki

[joek71]

Ik thanks, one more question, the higher the dividers the higher fsb?

[Player0]

You have that a little reversed. When you have higher FSB speeds, you need the larger dividors in order to keep the PCI in spec.

100mhz needs 1/3rd to make PCI 33mhz.

133mhz needs 1/4th to make PCI 33mhz.

166mhz needs 1/5th to make PCI 33mhz.

200mhz needs 1/6th to make PCI 33mhz.

[joek71]

what if my current settings is 158*9.5, then if I try to set the divider to 5:5:1 then the 5 will be divided into 158, correct?What would you recomend 5:5:1 or 4:2:1?

[Player0]

You mean 5:2:1 and 4:2:1 correct? Its commonly listed in FSB:AGP:PCI format.

Anyway, 158mhz in 5:2:1 produces PCI of 31.2mhz. Slightly under spec.

158 in 4:2:1 results in PCI of 39.5mhz. Slightly over spec.

Obviously 4:2:1 is faster, however some devices may not function overclocked.

You are using 4:2:1 now, and since it is working, that is best.

[dicki]

spot on p0!

and as we said the kg7 doesn't have a 5:2:1 divider anyway...