Change your old memory, batterylife benefits! (56k warning)

[jiopsi]

What is 9W?

9 Watts of power, measured with Notebook Hardware Control when in battery mode.

[jiopsi]

Apparently my B1 revision Dothan wasn't as good undervolter as gunston's or aaa's. What revision do you have, you can use CPUz to check it. Here are my tests Banias vs. Dothan.

Banias 1.5GHz 1MB 130nm B1

Dothan 1.6GHz 2MB 90nm B1


1. In idle difference is about 0,25W for Banias.
2. Near idle, the difference gets smaller.
3. In stress it turns to favor Dothan.

- Because Banias is about 10% slower at same speeds, theoretically it consumes more power also near idle, if the task given is something like superpi which can be processed faster.
- Clearly my Banias was great undervolter sample and Dothan not so great sample, although it gets 0,7V in 6x.

[aaa]

How strange.

I am using a C0 (which needs hacks to work), pretty sure gunston is using a B1.

[jiopsi]

NHC stress test passed about same as gunston's, but Superpi did need more voltage. What hacks does C0 need?

[aaa]

NHC stress test passed about same as gunston's, but Superpi did need more voltage. What hacks does C0 need?

It basically needs NHC I think (or is it RMClock?), ie it won't work properly unless you manually set the voltages.

[jiopsi]

Manually every time you start? Or just once?

[aaa]

Well apps like NHC start automatically, so just once.

[jiopsi]

Ok, so no problems there. Maybe I will try change newer revision, if I can find it couple of dollars. Do you know if LV Dothans like 758 are supported in BIOS?

[aaa]

Ok, so no problems there. Maybe I will try change newer revision, if I can find it couple of dollars. Do you know if LV Dothans like 758 are supported in BIOS?

I don't think it'll matter; the reason the C0 doesn't work is because it's not supported in BIOS, but it is as you can see still usable.

I also think it won't necessarily be "better", as only the soldered ULV models really push the limits. In fact, the 758 is probably soldered as well. If you can find one on the cheap, go ahead, but don't go out of your way for it.

[jiopsi]

Do you get somekind of error messages or how do you know it's not supported in BIOS? Just found un-soldered 758 C0 about 10€, so if I can win that on ebay I will be testing that.

All in all, I think normal, LV and ULV models are all the same, just cherrypicked and named in factory.

EDIT: found that 855PM chipset doesn't support LV or ULV according to Intel http://compare.intel.com/pcc/showchart. ... ture=en-US

[aaa]

Do you get somekind of error messages or how do you know it's not supported in BIOS?

It boots up stuck at 600mhz.

EDIT: found that 855PM chipset doesn't support LV or ULV according to Intel http://compare.intel.com/pcc/showchart. ... ture=en-US

That sounds silly. LV was around before the 915.

[jiopsi]

EDIT: found that 855PM chipset doesn't support LV or ULV according to Intel http://compare.intel.com/pcc/showchart. ... ture=en-US

That sounds silly. LV was around before the 915.

Yeah, I though that also, so maybe I will give the 758 a try.

[jiopsi]

Found some newer 256MB memory and tested it, memory usage was 209MB with both, and I don't know if it matters in how many % it is from whole capacity. I will be testing even newer memory which should consume about same with 512MB if the specs are comparable.


With 512MB Mosel -02

With 256MB Hynix -04


- 0.4W in idle is about right
- It grows to ~0.95W in SuperPI
- About same in Ram stress test
- So, specs are quite comparable, and seems that only IID0 and Standby matters
- Again, don't know if % of used memory matters, but I will be testing with even newer 512MB memory (with about same specs), so we will see if it matters.

[Nicola]

I ask excuse you. I do not speak English and I have read this fastly post; I have decided the same to write this, I hope is "useful".

Banias
normal 1,39 V
minimal frequency 0,96 V

Dothan
normal 1,340 V
minimal frequency 0,988 V

If the cpu always work to the minimal speed then Banias consumes little.
If they always work to the maximum speed then Dothan consumes little.
If it is set up normal, depends on the work load. Obviously if the higher voltage works much consumes little Dothan using. If it works little it consumes little Banias.

[aaa]

Some ram tests. I'm not getting very good results .

Code: Select all

8.9w "Old" Hynix 256MB (8 chip)
8.9w "Old" Elpida 512MB (16 chip)
9.0w "Old" Kingston/Promos 512MB (16 chip)
9.1w "Old" 2x512 (elpida + kingston)
9.0w "New" Crucial/Micron-335 512MB (8 chip)
9.1w "New" Crucial/Micron-335 2x512
9.1w "New" Crucial/Micron-335 1x1gb (16 chip)
9.1w "Old" Kingston/Promos 1x1gb (16 chip)

So apparently it isn't as simple as "old" vs "new". Perhaps the Mosel stuff was particularly awful? In any case I'll try to get that same Hynix 512 and see.

And it appears the amount of ram (sticks or MB) doesn't matter much for some reason. I presume it's because most of it on standby or something.

[jiopsi]

Yeah, it definitely isn't easy as how old it is, because manufacturing process may have been same like years. Mosel was 140nm and never are definitely smaller, it would be nice if manufacturers would reveal this information. The specs seems quite combarable though, so it would be good to make decisions based from that.

Did you use NHC to check those wattages, if so remember to use about same battery % level in tests, as voltage drops when battery gets empty. Did you test in stress?