Can't run at FSB 133....

[CP]

I have Mushkin 128MB PC133. So I suppose I can run my PC at FSB 133mhz however it turned out freezing most of the time. It can't even go up above FSB 108mhz. So am I missing something?

I'm running Duron@1Ghz (105*9.5) with Abit KT7-Raid right now. I'm just wondering how ppl actually running their memory above 133mhz....

Thanks
CP

 

[BurntKooshie]

Quick question: Do you know if you got "budget PC 133" or "higher quality PC 133"? Better yet to know, is what CAS latency you are running, or rather, trying to run. If you could find out, that'd be great

Basically, if you got "cheap stuff" its possible that it doesn't like to do CAS2, which might be the bios default. Most "inexpensive" PC 133 is CAS 3.

[EDIT]BTW - its not uncommon to be pretty limited in terms of FSB increases with Athlon motherboards, because of the EV6 bus, and the chipsets. Infact, most motherboards cap out around 110mhz, so its not suprising. Some have gotten quite a bit higher, but thats the exception rather than the rule.

 

[Mustanggt]

BurntKooshie My KT7 is running @ 114 MHz FSB. CP
There is a adjustment in bios that lets you set your mem to host/pci clock enable that to run your mem @133 without increasing your FSB to 133.

 

[paulip88]

Yes, you are missing something. To get the memory to run at PC133, go to the BIOS and set the memory to PC133 or the mem clock to FSB+PCI (whatever your BIOS option happens to be).

Also, the FSB of your board typically cannot get above 110MHz.

 

[paulip88]

Another thing: the chipset does not have the proper dividers to accomodate a 133FSB. This means that if you set it to that speed all your components will be way out of spec (like the BX running at 133).

 

[wonder mike]

you might have a dud

 

[MassMhz]

No one i know has gotten past 118 fsb with the Birds and that wasn't stable.111 is as high as i would go anyway,because any thing above will give too much pci/agp bus.

 

[jimmygates]

Your trying to set the FSB to run at 133mhz and not the Memory to run at 133mhz. Like Paulip888 said, change the memory setting in BIOS from HOST CLK to HOST CLK + PCI CLK (100mhz Host Clk + 33Mhz PCI Clk = 133Mhz) and that should run the memory at 133mhz. The FSB is meant to run at 100mhz. (EV6 bus = 100mhz x 2 DDR = 200mhz!) Usually no KT133 chipset hits over 110mhz FSB.



-JImbo

 

[Dennis]

Similar setup here with Duron 1Ghz...I have the "budget" PC133 I got ages ago from Mushkin. It will not run CAS2 (According to SiSoft Sandra, it's only CAS2 at 66Mhz and below). I am running it at 134 Mhz (FSB+PCICLK), with CAS3 and most aggressive memory timings with no instabilities.

Here's a description of some applicable BIOS settings...can't remember where I got these from...



SOFTMENU III

Enhanced Chip Performance, This feature increases the performance of your Duron or Thunderbird Processor.

Force 4-way interleave, This guarantees that your RAM runs at 4-way DRAM interleave

Enable Dram 4k-page mode. This feature increases the performance of your RAM modules

DRAM Clock refers to your memories clock speed. A setting of Host CLK gives you 100mhz memory speed, and a setting of Host CLK + PCI CLK gives you the 133mhz memory speed.


ADVANCED CHIPSET FEATURES


Bank 0/1, 2/3, 4/5 DRAM Timing is for you to use if you want to increase the speed of your RAM modules, you have the choices of: SDRAM 8/10ns -> Normal -> Medium -> Fast -> Turbo (fastest). If your memory will tolerate the Turbo speed I recommend setting it to this as it will give you the most performance.

DRAM Bank Interleave can activate the DRAM bank interleave. Options are Disabled -> 2-way -> 4-way(fastest). Again, if your memory will tolerate the 4-way interleave I recommend you use it as this will give you a noticeable boost in performance. (NOTE: DIMMS smaller than 128meg can't use 4-way interleave)

Delay DRAM Read Latch sets the time required to catch DRAM data. If the DRAM load is heavy, such that you had three double sided DRAM modules installed, you may need to choose a longer delay time for data reading.

MD Driving Strength. You have 2 options with this: Hi -> Lo. This option lets you adjust the driving strength from the north bridge to the memory data line. With heavy memory load, you should set it to Hi for better driving capability, it has negligible effect on system performance.

SDRAM Cycle Length. You have the option of either 3 or 2(fastest). This option sets the CAS latency timing of the DRAM system memory access cycle when the SDRAM system memory is installed on the motherboard, default setting is 3 but if your SDRAM can handle the latency of 2 I recommend it as it gives you higher system performance.



It's best to change these one at a time, then go into Windows and do some stability testing...setting a bunch of them at once will make it tough to figure out which one is causing problems, if it doesn't work out.

Good luck,

Dennis