sis645dx (Asus P4S533)

[Guest]

I'm looking to buy a new system and have chosen to buy a P4 (as AMD products always have given me a hard time). I am quite a newbie at this (meaning that the last PC I bought was 2 years ago). I am just about to get me an Asus P4S533 mainboard with the SiS645DX chipset. But now I'm just wondering. How is it that it can run the FSB at 533Mhz (133) with a 400MHz (100) processor. Is it me (that have gotten the theory all wrong) or is the mainboard just way ahead of it's time? Or it might only infuence the memory? Oh, man, I'm disoriented

Following question: Can I run the P4 (overclocked) at 133 without any extra large cooling/labor efforts?

And how can I determine if the memory is 2.0 or 2.5 when I'm at the store?

 

[sir_jakontil]

hi kolben, i am not really sure how it works, but yes it does support the current 400Mhz bus
some people from other forums, use the P4S333 and flash it with the bios for P4S533 and it works as if the moterboard is P4S533 though it only supports ATA 100

for the complete explanantion, follow this links
http://www.asusboards.com/forums/showthread.php?s=&threadid=15865

AMD is good, but Intel is more fun

 

[o1die]

One review of sis 645 boards couldn't get any of them to run stable at a case 2 setting. I can run mine at case 2.5 stable with an fsb of up to 171, but run it at 166 to keep my pci modem running smoother in spec. I would order samsung pc2700 online if possible, even if you buy everything else at your local pc store. The 533 fsb is just a marketing gimmick, as far as I'm concerned (133 fsb quad pumped) just like the athlon (133 double pumped). The ratio setting of 4:5 permits the memory to run at 166 fsb. Crucial has also come out with a true pc2700 memory, but I don't know if it will run stable at case 2. The difference in speed between case 2 and 2.5 is not enough to worry about.

 

[Crashman]

At stock speed, the i850 with RDRAM and the P4S333 with DDR333 are neck and neck. But when you overclock, the RDRAM can go 33% over, while the DDR333 CAN'T. So if you're looking to overclock, look to RDRAM, less you get stuck backing down your DDR333 to a lower clock ratio. Samsung RDRAM overclocks the best.

Look at it this way: With RDRAM you can go from PC800 to PC1066 speed when you go from 100 to 133. So the ratio stays the same, both overclocked. But with DDR you go from the 100/166 setting to the 133/166 setting, no corresponding memory bandwidth increase like you would get with RDRAM.

What's the frequency, Kenneth?

 

[Guest]

...but the P4S333 doesn't have the DX-chipset?

http://www.asus.com.tw/mb/socket478/p4s333/overview.htm

 

[Crashman]

whatever chipset you want to use, DDR333 cannot be overclocked by 1/3, while Samsung RDRAM can.

What's the frequency, Kenneth?

 

[Scout]

The P4's out there today are only rated for 400 MHz. FSB speeds, however you can get one of the new "Northwood" 1.6 GHz. P4's and put it on the 533 MHz. FSB speed this board offers and it overclocks the chip to 2.1 GHz.

Intel plans to release a 533 Mhz. FSB version of the P4 sometime soon, but I'm not sure exactly what the time-table is.

Scout
700 Mflops in SETI!

 

[Guest]

Just got my own P4S533 system built and running this weekend and I'd totally recommend it. I've got my FSB running at 133MHZ and my DDR400 memory running at 200 MHZ without increasing the vcore or memory voltages. It's been running stable and fast for two straight days! Here's my config:

Asus P4S533 MB
Pentium 1.6A GHZ - FSB 133 * 16 = 2.13 GHZ
OCZ PC3200(DDR400) SDRAM - 200 MHZ
Asus VCARD - GEFORCE4 MX V8170 64 MB DDR AGP