Pentium 4 on SiS645DX DDR333/DDR400 motherboard!!

[NFS4]

http://www.ocworkbench.com/2002/sis/645dxref/645dxrefp1.htm

 

[MadRat]

Nobody cared?

<<SiS645DX

We have seen many reviews of the SiS645 on the net. Today we bring you an exclusive of the latest chipset - the SiS645DX. SiS645DX is the new generation of the SiS645. SIS645DX supports the official 533Mhz standard e.g. those P4 that runs 133Mhz (533) FSB. Secondly, the SiS645DX officially supports the DDR333 standard. While lots of people thought DDR333 means running the CPU at 166/166 (333/333), that is not true as it is considered overclocking. In fact, it should be async 133/166 (266/333). To our surprise, SiS645DX has something even better which we discovered in the BIOS. The BIOS allows us to run the board at Async DDR400 mode. That means running the DDR module at 400Mhz (not 266, not 333)! Although P4 533Mhz CPUs are not available at this moment, we can always use a P4 ES by lowering the multiplier. In our tests, we lower the P4 1.5G's multiplier to 11x and raise the FSB to 133Mhz. We also tested the mainboard at various combinations of mode. e.g. synchronous 133/133, async 133/166 (DDR333) at Ultra timings and 133/200 (DDR400) at fast timings.

This picture below is the SiS645DX reference board. We have more photos on the next few pages.>>

Its the great white hope of the DDR users, single channel speed equal to or exceeding PC800 RDRAM. I'm surprised anyone would want to stay with the old SiS645 when this one allows DDR400 without staying below 533fsb.

 

[NFS4]

Yeah, this board owns!! Check out the memory bandwidth compared to RDRAM:Q

 

[fkloster]

Looks awesome...what is that P4 "ES" 1.5 they used for test anyways?

 

[frombauer]

<< Looks awesome...what is that P4 "ES" 1.5 they used for test anyways? >>



"ES" stands for Engeneering Sample, a p4 chip with unlocked multiplier. Cool, huh?

 

[Diable]

More then likely the shipping(i.e. non SiS made)645DX motherboards will perfom like ass compared to the SiS made engeneering board just the 645 boards from last year.

 

[Athlon4all]

Chipset support for DDR400 is one thing, actual DDR400 ever hitting the market in mass quantites and with a price compareable to PC1066 RDRAM is another. I doubt as I have said before that DDR will prolly end at DDR333 and then passing the torch to DDR-II.

 

[Mavrick007]

Yep, the P4 ES 1.5 is an engineering sample that allows you to still keep the 1.5Ghz but by unlocking the multiplyer so that 133fsb can be used (11 x 133, but this was still under at 1463Mhz).

It shows alot of potential out of the P4 and DDR since the benches gave good results from such a low clocked cpu.

 

[tigerbait]

<< Yeah, this board owns!! >>



of course, why wouldn't it? especially since I bought an Asus P4S333 last night :disgust:

:|

 

[LukFilm]

When do these boards come out? I just got Asus P4S333 as well ($70 shipped), but I didn't use it yet, so it's in brand-new condition. What exactly will these boards add and should I hold out? I didn't buy the Nortwood yet, and I can wait a bit. Thanks.

 

[Diable]

If SiS rolls this chip set out like they did the 645 it will be a few months before ECS releases a board that uses it and a month or two after that when the other board makes releases their boards. If I were you I would enjoy my new board now instead of waiting months until Asus releases a new board that uses the 645DX.

 

[LukFilm]

OK, great. Thanks for soothing buyer's remorse

 

[Soulflare]

<< of course, why wouldn't it? especially since I bought an Asus P4S333 last night :disgust:

:| >>



Same thought, except insert last week.

I doubt however, that my Crucial PC2100 would be able to hit DDR400 speeds and this board
will likely hit the market long before Crucial starts officially selling PC2700 memory.

 

[Fant]

I'm confused. The current Sis645 officially supports DDR333. It also supports ASYNC speeds of FSB/MEM 133/166. So would the current Sis645 board (Asus P4S333) running at Ultra timings with DDR333 and FSB/MEM of 133/166 obtain the same numbers as the 645dx? Seems like the only thing new is the option to use 3 DDR sticks instead of 2 and officially supporting DDR400 (which I'm told is officially supported on the sis645 based Msi Ultra anyway) and a hell of a lot easier bios overclocking options

 

[Duvie]

I am right there now with 133 w/ 4:5 ratio to give me 133/166 and my scores are right inline with review...no cas 2 for me though...

I also think this board could do ddr400 if they give us some other ratios....my memory at 118fsb (2.12ghz)with 3:5 was doing 390mhz ddr and got mid 2700's

 

[Fant]

Sweet...but how many DDR333 can o/c to 400mhz? I cant even find anyone selling a DDR400 chip so figure 1-2 months before you'll see both the board and the memory to support it out...by then rambus I believe has something else up their sleeves...

 

[MasterHoss]

Yeah, I too, question the availability of DDR400 RAM.

 

[Slacker]

I have my Kingmax PC2700 running at 362mhz DDr and get 2700mbps memory bandwidth