170 MHz FSB and 100% stable!!

[Celemine1Gig]

Hi guys and gals,

just added some case cooling to my setup and now it's 100% stable at 170 MHz FSB!! In fact, I just added two 120x120x38mm fans to the side panel. So I think I was right that it was a cooling problem when I experienced crashes at 166 MHz FSB before without case cooling! !
I didn't add any heatsink that I wanted to add, yet.
Who knows perhaps 200 MHz FSB will work in a few weeks when all the planned modding is finished!!

As for now I'm quite happy @170 MHZ FSB:D

BTW I'm running my RAM @CAS3 3-3-3 7/9 and I have the divider pll16 enabled to keep my PCI speed @31 MHz. As I said everything stable so far. I could probably use more aggressive RAM timmings, but I want to play it save!

[nucro]

170 fsb !! So your case cooling really worked. What are your temps and how much did the extra cooling help? I hope you can do 190+ since there is no worry about the pci speed. But isn't the pci is @34 since your fbs is 170?

[Celemine1Gig]

I can't really monitor my temps, as my mainboard has a problem reading the on die thermal diode. I think it always reads temps that are about approximately 12°C too low. For example room temperature is 23°C and my case temperature is 25°C(didn't messure it with case colling yet) but it displays a CPU temperature of 13°C idle upto 21°C full load!!
That's way too low. And I used MBM 5.1 with the CPU sensor set to "Sensor 3 diode", which should be the right setting. I already contacted Gigabyte, but I didn't get an answer.
But who cares! I'll add some heatsinks tomorrow(northbridge, southbridge, clock generator, voltage regulators and heatsinks on my memory chips in aweek or so) and then we'll see if 200 MHz FSB is possible.:)

Update: Nearly forgot your question about the PCI speed, sorry!!
No it's not 34 MHz, it's actually 31 MHz, because this mainboard doesn't really use a 1/5 PCI divider or a 1/6 PCI divider as one would assume. It seems to use some sort of external pll to control the PCI speed! But it's nearly 1/5 and 1/6 and even better there are settings that represent 1/7, 1/8 and more!!! :burn:

[muddocktor]

I'm just jealous as hell at that ram you are running.:D This micron stuff craps out at about 155-158 fsb when running cas 2. I need your ram !!!;) :D My P3 1.26S project is coming along nicely and I'm about to start insulating around the socket; got water system and pelt psu configured and rigged up in my case. After I get the board insulated I should be getting it running.

[Celemine1Gig]

Unfortunately this RAM is only available in Germany!! I just sold one stick here in Germany on eBay, because I had ordered two sticks but only need one!

I would buy the RAM on eBay! MCI PC150 CL2 RAM:
http://cgi.ebay.de/aw-cgi/eBayISAPI.dll?ViewItem&item=1322714382

http://cgi.ebay.de/aw-cgi/eBayISAPI.dll?ViewItem&item=1322750341

http://cgi.ebay.de/aw-cgi/eBayISAPI.dll?ViewItem&item=1322750059

http://cgi.ebay.de/aw-cgi/eBayISAPI.dll?ViewItem&item=1322342056

Perhaps if you're lucky, one of them will also ship to the US!!

I already asked the company(www.mci.de) if they would ship to the US, but unfortunately they do not!! They said that the effort would be too high. I asked because Outhouse also wanted some of that RAM.

[nucro]

Originally posted by Celemine1Gig

No it's not 34 MHz, it's actually 31 MHz, because this mainboard doesn't really use a 1/5 PCI divider or a 1/6 PCI divider as one would assume. It seems to use some sort of external pll to control the PCI speed! But it's nearly 1/5 and 1/6 and even better there are settings that represent 1/7, 1/8 and more!!! :burn:

:rolleyes: That's strange!! :rolleyes:
1/7, 1/8 :eek:

[Yodums]

Sweet if only you were on 200fsb and had DDR ram you'd be neaerly 100% utilizing it ! :D

Yodums

[Yodums]

By the way considering you have CL2 PC150 ram it should do fine at CAS2, try it out.

Yodums

[Celemine1Gig]

I'll try CL2 setting if my northbridge is cooled properly. At the moment the northbridge is in fact the limiting factor, because it getas very hot at that speeds. Running Cas3 at 180 MHz is nearly tghe same as Cas2 @150 MHz.
And of course I'll have to add cooling to my clock generator.

[muddocktor]

Celemine1Gig,

I found a way around my mem speed dilemma with this XET board and the 1.26S proc. I went and set the motherboard switches to run 133 fsb with 100 fsb mem speeds. I can still overclock the fsb in bios like this but it slows my mem speed down 30-40 mhz. I got the proc up to 1577/166 fsb, just using the stock hsf that came with the proc and the post screen shows that the memory is running at 125 mhz. This was using the pll 16 setting ( I think, got the board down, insulating around the socket for the pelt setup) in bios to keep pci/agp in spec. I know that a few other people are trying to run the 1.26S procs with this board and figured I would post this up in case anyone else has run into the memory limitation that I had. This speed seemed to be getting close to the max speed this proc will do with the stock cooler; I had the vcore set @ 1.675v in bios and it actually was running @ 1.63v, both by sandra and in bios. I didn't want to try a higher voltage with just the stock hsf, but I definitely will push it with the pelt/watercool setup.

[Flu!d]

Muddocktor....

You must be one of the lucky people with an XET like myself as the XET-C does not have the independant FSB/RAM speed option as it does not have the nessecary dip switches on the mobo....

[oldfart]

Hey, me again. I'm still tweaking my setup. A couple things:

The XET-C does not have the switches, but you don't need them. You can set the memory speed in the BIOS Advanced Chipset Features. You can select System Memory Frequency = Auto, 133 or 100. Example: You are running 160 FSB, and you pick system memory freq = 100 instead of the default 133. You will be running a 120 MHZ memory speed. I'm not wild about this setup myself. It works, but you will take a big performance hit. The lower mem speed and the asynchronous timing really slows things down (on any board). You are better off running a lower FSB speed and keeping your ram speed up. Its one thing to have the highest CPU Frequency, another to have the fastest system.

Next: I GOT THE PLL/16 WORKING!! WHOOT!! :D:D:D
I could never get it to work with the CuMine CPU (160 PLL/16 30/60). The first time I tried it with the PIII-S Tually, I got a very scary message that my BIOS was corrupt. I was nervous about trying it again.

I tried it again today and have it going!! I'm still fine tuning, but what I have so far is:

PIII-S 512K 1.26 CPU
160 FSB PLL/16 30/60
1.575 Vcore <---little higher than I like
1.52 GHz
Mem speed 160
Ram timing 3-3-3 7/9. <--This I'd like to improve.

It will run Prime95 stable with this setup.

Still tweaking.....I'll update later.

[oldfart]

Update...

Not really stable. With a 1.575 Vcore, 3-3-3 7/9 ram timings, its not quite right. I can run prime95, but had a couple freeze ups on boot. I also had a couple BSOD stop errors when just doing normal Windows stuff.

I'm going to just leave it @ 152 FSB (my nic stops working @ 153), 1.44 GHz.

Sandra memory score with the 152 FSB 3-2-2 5/7 is 482/470
Sandra memory score with the 160 FSB 3-3-3 7/9 is 434/433

Maybe I could get it stable with more Vcore or more cooling, but its not worth it for 80 MHz. 1.44 Ghz runs @ stock 1.45 Vcore, 3-2-2 5/7 ram timings. I like the low Vcore, faster memory with the 1.44 GHz setup.

[funnyperson1]

Originally posted by Yodums
Sweet if only you were on 200fsb and had DDR ram you'd be neaerly 100% utilizing it ! :D

Yodums

actually, ive found out, that what helps the AMD cpus is not the bus but the actual effect of double pumping the 100 bus....but if you had SDRAM running at such speeds it would crush most DDR systems out there in bandwith as it is truly twice the bandwith and not 15% or so increase...

[muddocktor]

I'm hoping that once I have the 120 watt pelt and watercooling going on my mobo & chip, I will be able to run 175-185 fsb with this proc and have the memory running in the mid to high 140's @ 2-2-2-5/7 timings. This should still give me good mem bandwidth without having access to that super ram that Celemine1Gig has access to in Europe.

[Yodums]

Originally posted by funnyperson1


actually, ive found out, that what helps the AMD cpus is not the bus but the actual effect of double pumping the 100 bus....but if you had SDRAM running at such speeds it would crush most DDR systems out there in bandwith as it is truly twice the bandwith and not 15% or so increase...

Yea I kind of figured that as 133fsb AMD machines were to run on 266fsb so the DDR bandwidth would definitely exceeds SDRAM capibilities :)

Yodums

[F0]

PLL/16 ???
what's this
is it from your mobo
or what ???
5.5 divider ?!?
WTF ?

[Yodums]

Originally posted by F0
PLL/16 ???
what's this
is it from your mobo
or what ???
5.5 divider ?!?
WTF ?

The Gigabyte GA-6OXET have like 1/5, 1/6 dividers for really big FSBs.

Yodums

[pappypete]

Sure does!!