Real life battery life differences between P7370 vs. T5870

I'm looking at HP 2230s, a 12" with either P7370 or T5870.

Kevin got 3 hours and 30 minutes on energy saving settings in the NBR Review with P7370.

How much would I get with T5870?

I know the TDP differences is 25 vs. 35 watt. But I also know that TDP does not equal power consumption.

 

Hi PhilFlow

I checked it up - with a Core 2 Duo T5870, the battery life is estimated to be 3.5 hours as well.

 

Thanks. You mean HP says so?

Generally I don't really trust what the manufacturer says.

 

The closest references I could find for you-

Dell Vostro 1510 with 1.8GHz T5670 and Intel X3100 graphics- 3hrs 26min (6-cell)
Dell Vostro 1510 with 2.0GHz T5870 and Intel X3100 graphics- 3hrs 8min (6-cell)

The T5870 isn't a very common processor...at least not in reviewed models. I think Dell Vostro, Toshiba Satellite Pro and some HP business models are the only ones to offer it.

The T5870 and T7250 are essentially identical (2.0GHz, 800MHz FSB, 2mb L2, 35W TDP, 65nm manufacturing process). Perhaps you could look at the battery life of the T7250 if you need more info.

 

i guess around 15min??

 

Thanks for that.

I guess something like that too. Maybe 10 minutes. It's just a guess though.

 

It will depend a lot on how heavily the system is loaded, just idling the run time difference will probably only be a few minutes, but if you were for some odd reason to decide to encode video or something on battery you'd see a pretty healthy difference. The highest power usage of any of that series is under 65 watts, so adding a few watts is a pretty big jump proportionally speaking.

 

That's good to know. My use is mainly below 5% CPU utilization which would make the T5870 a good choice.

 

If you study the electrical specs part of the Intel data sheets you will see that the P series CPUs have lower maximum allowable idle and sleep currents than the T series CPUs as well as having lower maximum power. There is potentially about 2W difference in sleep power and 5W at 800MHz.

If you strike lucky, you could get a T series CPU which falls within the P series specs (Intel will label the parts according to the market demand as well as the technical requirements). Or if you are unlucky you could get a gas-guzzler CPU which is at the upper limit of the specs.

John

 

Interesting... so if I get a P7370 and get unlucky it might even have worse battery life than T5870.

I'll just opt for the cheapest option then.

 

I think he's saying Vice Versa, if you get a GOOD t5870 it may well be as good as the P7370, but if you get a crap one it won't do as well. The Ps are pretty well cherry picked all the time, the Ts are whatever they had left over, but sometimes if they have lots of good P worthy parts but need to sell cheaper T series parts they just bin them as Ts and sell them for less. My T3200 for example is the cheapest of cheap bins but it runs fine undervolted .275v, it's almost certainly a downgraded cpu, it could have at least been a T3400 if the cache was bad...