Limiting Factor w/ FSB OC'ing??

[Nighthawk69]

Hey all-

I was wondering what the limiting factor with FSB overclocking on Athy mobo's with the KT133 chipset is...? I is the memory or the chipset itself?

I have 128MB Micron PC100 SDRAM with an MSI K7T Pro and as I expected from what I've read it will not run games at 109 FSB (1200Mhz).

Any suggestions are appreciated.

 

[paulip88]

Some people say that it is the chipset. I think that its either the chipset or the memory (if people are using PC133 settings).

Try it and see how far it will go.

 

[Lecho]

The EV6 DDR bus is supposedly very sensitive to frequency changes, that would explain it as well.

 

[Nighthawk69]

OK, thanks -- sure wish I could get 109FSB with stability... :frown:

 

[Maniac9127]

<< The EV6 DDR bus is supposedly very sensitive to frequency changes, that would explain it as well. >>

No, it's not. You can easily put a chip in a 760 motherboard and get it to run at 133. The fact that it's DDR has nothing to do with it, and the EV6 can scale all the way up to 200MHz.

The chipset is the limiting factor. The KT133 wasn't designed to go above 100, and doesn't work well. And before you say neither was the 440BX, well, the KT133 isn't the 440BX.

 

[Lecho]

Of course the bus is scalable, up to 133Mhz I know, but any errors caused my overclocking and heat are doubled by the bus. It can transfer data twice per clock, but it can also screw up data twice per clock.

 

[Davegod75]

it's the chipset

 

[Lecho]

My friend told me, and it was confirmed in Anand's KT133A article, that VIA purposefully limited it's O/C ing ability. This is dissapointing because of the assumption that the Athlon depends heavily on it's FSB.

 

[kylebisme]

im up to 110 with my kt7-raid and that cheesy hsf that comes on it, mebey a hsf on the northbridge will do you some good too.

 

[rempe]

The chip set on my ka7 I could run at 117 stable

 

[MikeA]

My 700 does 784 @ 112fsb nice and stable. Been running like this for a month or so. It can post at 115 but later crashes, I'm guessing it's either the memory (Mushkin @ 149mhz CAS2) or the chipset.

 

[Nighthawk69]

MikeA: What motherboard is that on?

 

[MikeA]

Asus K7V with the 1008C beta bios, 1/2 L2 cache devisor, standard vcore (1.60). Memory at 149mhz 2/2/2 timings. I got an Alpha P125 with 2 60mm YStech fans on the Athlon. Cleaned the core and put some silicon compound between it and heatplate. Have the back of the Athlon casing modified with a 50mm fan on the back. An 80mm fan right behind the Athlon blowing the hot air out. I have no extra cooling on the North Bridge or clock generator, maybe that will be my next step, along with changing the memory to CAS3.