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21st May 2008, 22:49 | #1 |
[M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| Gigabyte GA-5AX Rev3.0 to Rev5.1 - The road to K6 victory Hey guys, It has been a while since I took my K6/2 500 for a 720MHz spin, but I'm back with another (read: better) motherboard. Yes, I needed a new one, as my P5A completely maxed out at 120x6 ... maxed out as in this is the maximum I can set the board to work at theoretically. I needed to find another board, one that can do way more than 120MHz ... and I found one! The Gigabyte GA-5AX Rev5.2 goes all the way up to 140MHz FSB, which suits me perfectly. Having looked on Ebay Belgium, but not finding anything, I switched to Ebay Germany as those pages have an incredible amount of hardware ready to be purchased. Veni, Vidi, Vendo ... yes, I found a GA-5AX and after a week it got here. BUT ... (I guess you all saw this one coming, no?) When I opened the box to have a first glance at my board of glory, I noticed this wasn't a Rev5.2 board ... it was a Rev3.0! Optimistic as I am, I quickly tried to find out if the revision might not be as bad as I thought it would be. http://tw.giga-byte.com/Support/Moth...ProductID=1578 Perfect! A motherboard that has different manuals for different PCB revision, it doesn't look good. Nope, it doesn't look good, only 100FSB at most ... this board wasn't worth the euros I spent on it and the worst part: it costed me quite some golden coins to bring the board to Belgium. Already brought down, I decided to have quick look at the Rev5.2, just to see what the big difference is. Yeap, that's what I was looking for: 140MHz FSB. But wait, JP9 ... I came across that multiple times already. Yes, in the first manual as well and ... You see that, lads and gents? I can turn this baby into a Rev5.1 with one simple modification. Turning this board into a Rev5.2 requires me to find the missing JP10, which I haven't found on this board. Now, all is well, you'd think, but this is MADSHRIMPS, my friends, we are always pushing things over the edge. How can I eventually make this board run higher than 135FSB? In theory it's possible, the PLL supports 140FSB, the only thing I need to figure out is how I can find that last jumper: JP10. That'll be something for Geoffrey, I'm afraid . |
23rd May 2008, 18:33 | #2 |
[M] Reviewer Join Date: Nov 2004
Posts: 4,127
| I have to work in Kortrijk next monday, maybe I can stop at your place, don't know the exact hour though. In between 9u and ... Or maybe next thursday, then I'll be in Waregem. |
23rd May 2008, 18:41 | #3 |
[M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| Next thursday I'm in Gent to do my first exam, tomorrow is not a problem, though. Back in the lab in the attic? |
23rd May 2008, 19:08 | #4 |
[M] Reviewer Join Date: Nov 2004
Posts: 4,127
| No time tomorrow, neither sunday. |
23rd May 2008, 19:11 | #5 |
[M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| Woops, I meant monday |
24th May 2008, 11:00 | #6 |
[M] Reviewer Join Date: Nov 2004
Posts: 4,127
| Where did you find the datasheet if the ICS 9148BF-36 PLL? Are you 100% sure that rev3 and rev5.2 use the same PLL? |
24th May 2008, 12:19 | #7 |
[M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| I'm pretty sure the ICS is the exact same, there exist windows overclocking tools for the GA-5AX and there's no difference between the revisions. Datasheet was from another pll: the ICS9148BF-04. I reckon they work the same? |
24th May 2008, 14:40 | #8 |
[M] Reviewer Join Date: Nov 2004
Posts: 4,127
| I know the ICS 9148BF-04, recap of its datasheet: 3 Frequency Select pins, maximum front side bus clock = 83.3MHz. The Pcchips Socket 7 board I have over here has the ICS 9148BF-17 PLL, which has the option to set up to 100MHz front side bus clock via BIOS, no datasheet available either. The main pin functionality remains the same probable. |
24th May 2008, 15:00 | #9 |
[M] Reviewer Join Date: Nov 2004 Location: Waregem
Posts: 6,466
| This datasheet should be it: http://www.idt.com/?partID=9148BF-36 |
24th May 2008, 15:13 | #10 |
[M] Reviewer Join Date: Nov 2004
Posts: 4,127
| Up to 100Mhz, so says the datasheet. So ICS 9148BF can have different frequency select with different Pattern Numbers. -04 up to 83MHz, -36 up to 100MHz. What precise pattern number do you find on the rev5 board? |
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