T42 overclock

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Batuta · #31 Post by **Batuta** » Mon May 02, 2005 10:32 am

FTC · #32 Post by **FTC** » Mon May 02, 2005 12:20 pm

How sure are you about that one Zeiphard?

Well,.. I'm not Zeiphard, but since I have the data already measured in my T40, under full load, my Banias processor running at 1.5Ghz is at 74ºC. When I overclock it and run (full load) at 1.7Ghz, it heats up to 77ºC, so it is a 3ºC difference for 180Mhz gain.... of course this will depend also on ambient temps and how your specific heatsink is performing...

Flandry · #33 Post by **Flandry** » Tue Sep 27, 2005 4:56 pm

What a bunch of philistines! FSB overclocking doesn't need to increase heat at all--just reduce the maximum multiplier. That way the Pentium-M is less bandwidth starved, and can run more efficiently each clock. At moderate OCs it's a very good way to get better performance without any drawbacks. After all, the much-hyped Sonoma is simply a Dotham on an overclocked FSB!

The location of the clockgen file has changed somewhat, and it's not clear from the webpage where to get it, although the clock generator PLL is listed as supported. I simply filled in the number in the URL and was able to get it.

Unfortunately, although the program properly populates the frequencies of the fields when i click on "get", if i fiddle with the dials at all, the numbers turn into something cryptic that doesn't look too promising. I didn't have the courage to click on "set" at that point. I don't want to disassemble my TP today to find out which PLL i have, but i'm guessing it's one of the locked ones. Model is 2374-3VU, which has the faster video processor (the 9600), so perhaps the upper end vid chip TPs are the locked ones (the 42p being the other known example).

I also tried the setFSB for the X31, and it failed to make any changes either. RMMA was unable to set CAS to 2 instead of 2.5, as well-is that related? I would set it, and then it would change back automatically. However, when i decreased one of the other timing settings, i got a hard lock and had to reboot.

Too bad-what with running very cool at less than 1V at almost every speed, it would be nice to get a bit more bandwidth to go with the cake i have and am eating, too.

nrj45 · #34 Post by **nrj45** » Tue Sep 27, 2005 11:47 pm

I experienced the same thing with rmma with one difference... my CAS settings stay (even if i reboot) but the benchmarks didn't show any difference in latency times or throughput. Actually i have 4-4-4-12 settings and am unable to change them... sigh

Flandry · #35 Post by **Flandry** » Wed Sep 28, 2005 5:38 pm

Wow, those are terrible timings! I assumed all the RAM IBM used was at least CAS3 in the spd. Do you have any idea why it's so high?

Did you use the most recent version of RMMA? I wonder if it now detects when there is no real change, whereas before it mistakenly reported a sucessful change.

On a vaguely related note, does anyone know if a 512MB and 1024MB stick can be used in the TP42 together? They don't have to be matched in size, do they?

FTC · #36 Post by **FTC** » Wed Sep 28, 2005 5:50 pm

Hi, well, the 2 sticks of PC2700 DDR of my T42 (orig from IBM) are 2.5-3-3-7 timings... I'd bet RMMA was not working properly in your system.. try another tool such as SiSoft Sandra to verify those...

yakman · #37 Post by **yakman** » Wed Sep 28, 2005 7:00 pm

FTC wrote:Hi, well, the 2 sticks of PC2700 DDR of my T42 (orig from IBM) are 2.5-3-3-7 timings... I'd bet RMMA was not working properly in your system.. try another tool such as SiSoft Sandra to verify those...

The T43 uses DDR2 which has slower timing than the DDR that the T42 uses.

Flandry · #38 Post by **Flandry** » Thu Sep 29, 2005 8:53 am

yakman wrote:The T43 uses DDR2 which has slower timing than the DDR that the T42 uses.

Sure enough, he's talking about a T43p. I assumed that he had a T42 with DDR since that was sort of the implied subject. I have my doubts that CAS2 would work on memory originally spec'ed at 4.

bl0tt0 · #39 Post by **bl0tt0** » Sat Oct 29, 2005 8:23 pm

Sorry to bring up a long dead thread, but my technical knowledge in the world of laptops is somewhat limited, but something Flandry brought up caught my attention. If it is assumed that a Sonoma chipset is basically a Dothan with a larger FSB, Execute Disable Bit Capability notwithstanding, does this mean that by overclocking a Dothan's FSB to 533 MHz would effectively allow one to install DDR2 RAM into a t42/p and get the full functionality of that as well? 25% difference in the FSB doesn't seem too terribly high, but learning a little more about this is definitely interesting to me. I guess it might come down to whether the T42 motherboard supports DDR2. Then again, after doing a little reading, the performance difference seems to be negligible. Opinions?

kyrotech · #40 Post by **kyrotech** » Sat Oct 29, 2005 9:43 pm

doesnt work on my T42 and I do have the CY28346 clock gen

chaging FSB will automatically freeze the laptop

nrj45 · #41 Post by **nrj45** » Sun Oct 30, 2005 2:26 am

bl0tt0 wrote:...does this mean that by overclocking a Dothan's FSB to 533 MHz would effectively allow one to install DDR2 RAM into a t42/p and get the full functionality of that as well? ...

I don't think so... ddr2 have a different slot shape so memory connectors would cause you problem...

I'm not sure of this but i think a read somewhere that the i855 chipset wouldn't work at 133MHz (quad --> 533).

T42 overclock

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