Whycan't I increase my CPU FSB Plus (MHz) KT7A???

[JAWS]

Whycan't I increase my CPU FSB Plus (MHz) KT7A???

I'm trying to get my Duron 700 over 1000 mhz. (950 right now) I can change the cpu fsb/pci clock somewhat, but when I increase the PLUS setting even by one, my system won't boot or goes to black screen. I have upgraded about everything there is in my case, except the power supply.(250 watts) Does the p/s have anything to do with increasing your mhz. If everything fails, I'm going to wait for Amdguy's post on increasing the core volts on the KT7A. Is there anything else I can do in the bios settings. Any replies would be greatfull!! I just upgraded to wz so I could unplug fan 1.

 

[UnseenMenace]

The FSB / PCI clock is only used when running a system on a 100 mhz FSB with PC-133 ram and multiplys the FSB x PCI ( 100 x 33 = 133 mhz ) in order to use to available memory bandwith, using this feature on a PC running a 133 mhz FSB would require you to have somewhere in the region of 166 mhz memory. <---- Beer induced statement and incorrect as pointed out by AMD guy I was thinking about the HCLK+PCICLK option.. sorry
A 250 w power supply will have enough trouble proving power to the system without doing a mobo mod to increase the voltage, I would suggest upgrading your PSU as soon as possible ( which does effect overclocking and more importantly stability, as the speed increases so does the demand for power ). If you still wish to consider the voltage mod.. this can be found on tweakhardware

 

[dozier768]

ya the power supply could cause it. you didnt say what your core voltage is. if its stock the problem is probably not enough voltage. jack it up to 1.85 or 1.9 and im sure it will post anso always remember to wach the temps

 

[AMDGuy]

>>The FSB / PCI clock is only used when running a system on a 100 mhz FSB with PC-133 ram and multiplys the FSB x PCI ( 100 x 33 = 133 mhz ) in order to use to available memory bandwith, using this feature on a PC running a 133 mhz FSB would require you to have somewhere in the region of 166 mhz memory.>>

The above statement is incorrect. FSB/PCI takes a vital role at any speed or setting. The way the CPU gets it's speed is multiplying the MULTIPLIER x FSB. For instance 7.5 x 100 = 750. 7.5 x 133 = 1000. I have plane o'l Cas 3 Micron PC-133 and my PC easily hit 146Mhz. One thing to keep in mind, settings on the KT7A are usually 133/33. The 33 is the PCI bus. Don't go much over that or the system will have problems as that is the bus the peripherals run on. The best way it to use the "Plus Mhz" feature. Mine is set to 133 with the "Plus Mhz" at 13 keeping the PCI bus at 33.

 

[JAWS]

My core voltage is set to the max. (1.85) With this setting,
I am very pleased with my temps. (29c idle, and never
gets over 40c when gaming) Should I upgrade to a
300 or 350, or maybe even higher p/s. Thanks for the
replies. I just feel with my temps that low, I could
get over 1000mhz.

 

[Jason]

snookhook (Jul 01, 2001 11:52 p.m.):
I'm trying to get my Duron 700 over 1000 mhz.
(950 right now) I can change the cpu fsb/pci clock
somewhat, but when I increase the PLUS setting even
by one, my system won't boot or goes to a black screen.
I have upgraded about everything there is in my case,
except the power supply.(250 watts) Does the p/s have anything to do with increasing your mhz. If everything fails, I'm going to wait for Amdguy's post on increasing the core volts on the KT7A. Is there anything else I can do in the bios settings. Any replies would be greatfull!!
I just upgraded to wz so I could unplug fan 1.

I am having the exact same problem. I've got a 1gig Tbird, 266. I can push it to 1400 using multiplier, but if I go even +1 on the plus setting, it fails to boot. I've got an enermax 300 watt PSU powering only the mboard, drives, and a separate generic PSU for the 13 fans. if anyone has any ideas, I'd greatly appreciate it!

 

[UnseenMenace]

AMDGuy (Jul 02, 2001 07:48 a.m.):
>>The FSB / PCI clock is only used when running a system on a 100 mhz FSB with PC-133 ram and multiplys the FSB x PCI ( 100 x 33 = 133 mhz ) in order to use to available memory bandwith, using this feature on a PC running a 133 mhz FSB would require you to have somewhere in the region of 166 mhz memory.>>

The above statement is incorrect. FSB/PCI takes a vital role at any speed or setting. The way the CPU gets it's speed is multiplying the MULTIPLIER x FSB. For instance 7.5 x 100 = 750. 7.5 x 133 = 1000. I have plane o'l Cas 3 Micron PC-133 and my PC easily hit 146Mhz. One thing to keep in mind, settings on the KT7A are usually 133/33. The 33 is the PCI bus. Don't go much over that or the system will have problems as that is the bus the peripherals run on. The best way it to use the "Plus Mhz" feature. Mine is set to 133 with the "Plus Mhz" at 13 keeping the PCI bus at 33.

Opps yes your correct I was thinking about the HCLK+PCICLK option on the memory settings.. guess I should sober up before replying to posts :/

 

[AMDGuy]

snookhook (Jul 02, 2001 11:41 a.m.):
My core voltage is set to the max. (1.85) With this setting,
I am very pleased with my temps. (29c idle, and never
gets over 40c when gaming) Should I upgrade to a
300 or 350, or maybe even higher p/s. Thanks for the
replies. I just feel with my temps that low, I could
get over 1000mhz.

Temps aren't an issue. It's voltage. My Duron 650 would run like a champ at 952Mhz 1.85V, with very low temps, but would go no higher until I did the voltage mod. Now I'm at 1022Mhz 2.05 V (7x146).

To test the system, set the FSB to default and the multiplier at default and add just 1 mhz in the "Plus Mhz" section. If the system fails to boot, I'd look to their being a problem with the board or memory. I'm using Cas 3 Micron memory and running at 146mhz is not a problem.

 

[dozier768]

oh i just thought of something! i forgot . i bet the problem is that you are setting the voltage via the mobo instead of the L7 bridges connect all your L7 bridges "this defaults the chip to 1.85" and i almost garontee it will post higher it go me to 1.124ghz i was stuck at 1.05 and it has also made it a little more stable. and use defoger paint or circut repair pen not a pencil

 

[JAWS]

When I reset all my settings,(7x100/33) I could
bump up the cpu fsb PLUS up to 10. Probably more
but the last I tried 20 and it just went blank. So with the
lower fsb setting I can increase the Plus, but when it
even come close to going over 950, something happens.
I even closed the L7 bridges to see if that would work,
but of course not. I just got a brand new stick of 128
megs of Crucial ram,(pc133) so I don't think that's
the problem. I can't even imagine what my pc would
do if I set it to 7+x133/33, that's why I think I need a
voltage mod. I need to get it up at least past 2.0
Amdguy whenever you get that guide ready please
post it on this thread, or give me the link of where it
will be!!!!!!! Thanks

 

[Fiz]

Bear in mind the the "CPU FSB +" DOES ACTUALLY AFFECT THE PCI BUS> This was confirmed by Abit over at viahardware.com in Paul's kt7 FAQ's. I have also lookied into it, all you have to do is set the CPU FSB + up by a few MHZ, then run sisoft sandra's mainboard info utility, I put my fsb to 133, then the CPU FSB + up by 5, well, when I ran sandra there was my PCI bus at 35MHZ. I think all it does is let yuo "fine tune" the fsb freq instead od being stuck with the preset ones that the manufacturer gives you.

Fiz

 

[Angry]

I have foudn if you have your memory running at CAS 2 then you cant use the Plus Mhz...Have to have your memory running at CAS 3 in order to use it.

Like say I am running 150/38x7.5 (until I get conductive ink) with memory at CAS 2, But if i try to use teh plus mhz sys wont post.
Unless I set mem to CAS 3 and go 133/33x7.5 and use teh plus mhz option then it will post and work fine.
But like I said Im using CAS 2 150/38x7.5=1125mhz

Oh yeah this is PC100 memory

Yahoo | Mail, Weather, Search, Politics, News, Finance, Sports & Videos

Latest news coverage, email, free stock quotes, live scores and video are just the beginning. Discover more every day at Yahoo!

www.geocities.com

 

[JAWS]

After many hours, this is what I came up with:
Mult. 6.5
CPU FSB/PCI 133/33
CPU FSB PLUS 13
In no way or how, will it let me get over 950.
That's why I need a voltage mod!!!

 

[AMDGuy]

Fiz (The Ringmaster) (Jul 03, 2001 08:10 a.m.):
Bear in mind the the "CPU FSB +" DOES ACTUALLY AFFECT THE PCI BUS> This was confirmed by Abit over at viahardware.com in Paul's kt7 FAQ's. I have also lookied into it, all you have to do is set the CPU FSB + up by a few MHZ, then run sisoft sandra's mainboard info utility, I put my fsb to 133, then the CPU FSB + up by 5, well, when I ran sandra there was my PCI bus at 35MHZ. I think all it does is let yuo "fine tune" the fsb freq instead od being stuck with the preset ones that the manufacturer gives you.

Fiz

I tested this and he is correct. Basically the system (when set to 133) uses a PCI divisor of 4. My current PCI bus is 37mhz according to Sisoft Sandra 2001se (146/4 = 36.5). I thought using the "FSB PLUS" feature of the BIOS by-passed this.

Thanks for the education Fiz!

 

[Fiz]

No prob at all, glad I could help.

Fiz

 

[JAWS]

I just had to back it down to
7x133/33 with the fsb+ 0. I figured
out something in this process. When
I was running at 9.5x100/33 my memory
bus speed was 100, but when I backed it
down to 7x133/33, it was 133. The
7x133/33 is actually faster right? I
had the mhz faster with the plus setting,
but it keep locking up. So I guess 933
is ok right now. One question, "Is the
voltage mod. hard to do?" I've seen two
different types to choose from.

 

[AMDGuy]

snookhook (Jul 04, 2001 12:03 a.m.):
I just had to back it down to
7x133/33 with the fsb+ 0. I figured
out something in this process. When
I was running at 9.5x100/33 my memory
bus speed was 100, but when I backed it
down to 7x133/33, it was 133. The
7x133/33 is actually faster right? I
had the mhz faster with the plus setting,
but it keep locking up. So I guess 933
is ok right now. One question, "Is the
voltage mod. hard to do?" I've seen two
different types to choose from.

I'ts a give take. I'd think a 133mhz FSB would be better as it speeds up the memory bandwidth. You'll have to play with your system and find that sweet spot that allows a good FSB as well as a good OC on the chip.

Do the voltage mod....solved all my problems.