Celeron 1,2GHz Tualatin overclocking and RAM???

[Celemine1Gig]

Hi guys and gals,

I just wondered if there's a mobo chipset, that let's you run a Celeron 1200@1600 Mhz while running the RAM @ 166 MHz(RAM = FSB+PCI). I think it should be possibe with the new Via chipsets Apollo Pro 133T/266T. It would give you a resepective boost in games like Quake3 if your RAm runs @ 166 MHz, I think.

Unfortunbately I have a board with the Intel i815EP b-step chip, so I think that option is not available for that board.

[melkus]

Only thing I can think of that comes close is the SOYO SY7VBA-133 board but the FSB tops at 155 :(

[[OC]_SR20DE]

Originally posted by Celemine1Gig
Hi guys and gals,

I just wondered if there's a mobo chipset, that let's you run a Celeron 1200@1600 Mhz while running the RAM @ 166 MHz(RAM = FSB+PCI). I think it should be possibe with the new Via chipsets Apollo Pro 133T/266T. It would give you a resepective boost in games like Quake3 if your RAm runs @ 166 MHz, I think.

Unfortunbately I have a board with the Intel i815EP b-step chip, so I think that option is not available for that board.

Running the RAM at bus speed of 166mhz would give you 1992mhz out of a T-Celery 1.2. I do not think that's possible. That would be way too fast. Some newer mobos allow PCI CLK settings that make it look like the RAM you could run at those speeds but they do not actually run at that speed. You'll know by checking the Sandra Memory bench. if it really worked, your Memory score would be through the roof. Again, it doesn't work that way. If you are to run a P3-S w/ 133 rated bus speed processor, yeah you can... easily do 160+mhz with good ram.

ASUS TUSL2-C is nice.
Iwill BD133u is better.. would allow you much higher range of voltage options for overclocking the Tualatin P3's or Celeries.

[Pinky]

No, you can't 'upclock' the RAM since the bus it's running at determines the CPU speed... and doing so would be a 'virtual' overclock, which just isn't possible with our current chip technology.

Of course underclocking is available on many boards, which is because a chip can always be underclocked :).

[[OC]_SR20DE]

Well said.. :)

[Sklathill]

Uhm...I think all the Intel VIA chipsets have a Memory setting such that you are able to run the memory 33 MHz faster than the FSB. I'm looking at it right now on my Shuttle board with the VIA PM133 chipset, running a Celery 566 (at 66 MHz, obviously) while the memory is running at 100 MHz.

The setting is called DRAM Clock. The choices are...

Host CLK
HCLK - 33
HCLK + 33

So, if you're running a PIII EB on it, you can run crappy memory at 100. If you got some _really_ nice memory, you can run the same processor with memory running at 166 FSB.

I doubt that VIA would take out such a feature for their Tualatin supporting chipsets, but I have no first hand experience with it. My advice is to grab some motherboard manuals off some websites and search for the above feature or something resembling it.

[Celemine1Gig]

Originally posted by Pinky
No, you can't 'upclock' the RAM since the bus it's running at determines the CPU speed... and doing so would be a 'virtual' overclock, which just isn't possible with our current chip technology.

Of course underclocking is available on many boards, which is because a chip can always be underclocked :).

But Pinky, your Abit VH6T should have an option in Softmenu III that's called:
DRAM Clock
and you can set it to:
HostCLK
HCLK-PCICLK
HCLK+PCICLK

If you run your chip at 133 MHz FSB and then set HCLK+PCICLK(133 MHz + 33 MHz) your RAM should run @166 MHz. That's what I was talking about.
You could perhaps try it. It should give a RAm speed of ~156 MHz.

Did you now get what I mean??

[[OC]_SR20DE]

Originally posted by Sklathill
Uhm...I think all the Intel VIA chipsets have a Memory setting such that you are able to run the memory 33 MHz faster than the FSB. I'm looking at it right now on my Shuttle board with the VIA PM133 chipset, running a Celery 566 (at 66 MHz, obviously) while the memory is running at 100 MHz.

The setting is called DRAM Clock. The choices are...

Host CLK
HCLK - 33
HCLK + 33

So, if you're running a PIII EB on it, you can run crappy memory at 100. If you got some _really_ nice memory, you can run the same processor with memory running at 166 FSB.

I doubt that VIA would take out such a feature for their Tualatin supporting chipsets, but I have no first hand experience with it. My advice is to grab some motherboard manuals off some websites and search for the above feature or something resembling it.

I have run the Abit SH6 before and I think it had that Host CLK option.. but I haven't actually tried the different setting on that. (I don't own that board currently). I still have doubt about these DRAM clock frequency of 33mhz increase will add to the FSB frequency. On the 6x multiplier for example, if one machine is set to run FSB at say... 133mhz fsb@ DRAM running at the same speed Vs. 100mhz fsb@ DRAM running at 33mhz higher, hence according to your claim, 133mhz. So you are saying that they both should have at equal performance in FSB memory throughput?.. I'm not questioning you.. I'm trying to find out about it too.. so can you run the Sandra memory bench to compare them two setup I mentioned? With the same RAM timing ofcourse.. and report back to us preferably with some screen shots? I would like to see any difference or equal performance. Thanks.. =)

[Celemine1Gig]

I do not own that Board! Pinky could do the testing on his Abit VH6T!!

[[OC]_SR20DE]

Ok Celemine =) That would be nice 2. =)

[Pinky]

Originally posted by Celemine1Gig
I do not own that Board! Pinky could do the testing on his Abit VH6T!!

I think I've looked, but will look again... wish I could take a screen shot :).

[Pinky]

OK, so here's the deal.

You will only get a +33 clock option if you're at a clock speed with a 1/3 divider... anything above 123mhz (124+) has a 1/4 divider and does not have this option... at 125, where I was running the Tualatin overclocked, it wasn't an option.

So here's the benchies... first, WCPUID when the clock is set at +33mhz in the bios:

[Pinky]

And now the memory scores:

[Pinky]

Conclusion:

The setting increases your through put in memory but doesn't change the overclock on the CPU, so you get about 2/3 the benefit of overclocking without overclocking.

Not too shabby, and today Pinky learned something :).

[Pinky]

Oh, the CPU score remained the same regardless of the clock adjustment:

[[OC]_SR20DE]

Thanks for your effort on testing those and posting screenshots =)

It would've been better if you compared the standard 133fsb with same ram clk vs. 100fsb with +33 ram clk... I wanted to see that as the scores should theoretically change. I wanted to see those at even fsb mhz between the two..

:)

[Pinky]

Originally posted by \(^0^)/
Thanks for your effort on testing those and posting screenshots =)

It would've been better if you compared the standard 133fsb with same ram clk vs. 100fsb with +33 ram clk... I wanted to see that as the scores should theoretically change. I wanted to see those at even fsb mhz between the two..

:)

OK, well since I've already had benchmarks for just that, here's the results of the 125MHZ overclock (since I can't get the chip to 133mhz, this will have to do):

[[OC]_SR20DE]

That is nice... yeah I see some score difference between a plain 125fsb with same ram clk vs. 100fsb with +33ram clk. The score on the 125fsb is indeed higher but I am also quite impressed with the performance boost from the 100fsb + 33ram clk. It sure does its job as expected to be.. i think we are clear now. Using that HOST DRAM CLK is a must for me if I had that option. :p

[Celemine1Gig]

OK thanks guys!!
I now know, that I can keep my i815EP b-step board. I first tought of buying the VH6T because of the opportunity to run a Celeron 1200@1600 @133 MHz FSB while running the RAM 166MHz, but now that I know it isn't possible, I'll just keep my MSI 815EPT Pro and tweak the hell out of it.

THX

Ingo

[Ruiner]

I did some testing a while back in this regard with my P3 (see sig).

I typically run the ram at 'host clk' or 133.
When upping memory speed to 'host clk + pci' (166) I actually lost a couple of fps in Q3.
The system was stable at CL2 and all memory settings to max.
Somehow I question that the ram was actually running at 166.
I was't even great memory, so it running stable at 166 at those timings is suspect.
Sandra actually listed memory speed as 133 anyway.