Dell Latitude E5570

Thanks very much. I couldn't quiet figure it out.

The problem is that both the models will cost the same.
Say that I don't need the extra power (i prefer it for "future time", but probably not on the expanse of battery life and temperatures), and perhaps you've already answered it, but say that I'll limit the i5-6440hq cpu to 85% (and say that it will reduce the heat significally) - will I get similar single core performance as with the i5-6300u?
(in other words, would it still be wise to buy the i5-6440hq if I don't really need it now?)

Regarding dgpu - non of the programs is using the dgpu (as listed in amd control center)

(btw, another reason to avoid the i5-6300u is because it only comes with 128 gb ssd where i live, so I'll have to buy m.2 ssd or order the bracket and cable for the 2.5 ssd, which is impossible from some reason.
a representative from dell's costumer service in USA told me:
A. That the bracket and cable arent corrently available.
B. not confirmd - that the bracket and cable for the e5550 is also compatible.

 

The % CPU has no direct relationship to CPU speed. You will probably find that having the i5-6440HQ set to 99% (ie turbo mode disabled) gives similar speed to the i5-6300u and is in the same power range. Do some more tests and try to understand more about the source of the heat - you won't see an immediate difference if the problem is from radiation and conduction off the CPU and heat pipe.

My E5570 is currently quite warm because Windows has decided to index the SSD which means one thread almost fully loaded which means a CPU temperature of 60 to 65C and a fan speed of 2200 to 2500 rpm. I notice some heat coming off the centre of the keyboard but the bottom of the computer isn't unreasonably hot. Dell could change the fan trigger points in the BIOS through a future update (I've known this happen) but I'm enjoying the low fan noise. My E7450 is pleasantly quiet compared to the E7440 and, for the same workload, the E5570 is quieter still.

John

 

Ohh still so much to know. Yea, the low fan noise is a treat but the Coil whine is a pain. I hoped that the low voltage used in the i5-6300u processor might reduce the risk for coil whine (i set it to 85% and i'm looking if by any chance there's any constant difference in coil whine).

what If i ignore the overheating, and am concerned only for battery life? Regarding my question on i5-6300u vs i5-6440 on 85%?

What do you mean by "radiation and conduction of the cpu and heat pipe"?
Thanks, I'll keep checking hwmonitor, and i'll check to make sure that the dgpu isn't being used.

 

You can try the coil whine fix suggest here where it is claimed that the is no adverse effect on the battery time. However, I have reservations since C-states are intended to reduce CPU power consumption.

I would expect the i5-6300u to give better battery time than the i5-6440HQ simply because it has lower potential to guzzle power so it's necessary to keep an eye on what programs are running and using the CPU (eg I use Firefox with FlashBlock and Adblock Plus to reduce the risk of adverts on web pages guzzling power). This was one reason I looked for a E5570 with the bigger battery. However, I have observed acceptably low power consumption under low usage conditions and in the same range as my E7450.

Explanation of radiation and conduction requires some physics lessons. Behind the grille on the bottom of the E5570 is a CPU, possibly a GPU and what looks like a flat copper bar which connects these components to the radiator grille along the outside edge of the fan. This illustration is from the E5570 owner's manual. I don't have the left end of it because that's the GPU.


Those components will radiate some heat which will warm up the bottom of the computer in the same way as you can feel heat from a fire. There's a lot of metal so there's a corresponding significant amount of radiated heat. Conducted heat passes the through the mainboard to the keyboard. We need to do some more research into whether Dell Command | Power Manager does make some changes to the fan operation and temperatures.

John

 

Hi, John! Is there bleeding, grainy and PWM? How is the white color?
Can you post pictures of the screen?

 

the company that manufactures the panel that is installed in mine is AU OPTRONICS. i have no idea what's the part number or how to locate it.
here are some pictures that i chose randomly.

in the picture you can see about 4-5 places where there is some serious bleeding. it gets worse when i press slightly on the corner of the screen, near the spots. there's also a small spot in the screen that "wobbles" when i move it, but usually non of the above is too noticeable or bothers me.

otherwise, it's a great bright and colorful screen. i have no idea about specifics or if there's PWM.

 

John, i've notice that the fan doesnt kick in (0 rpm) before the cpu reaches 68-70 C (then it runs temporarilys at 2200 rpm). Is it the same in yours?
so usually around 50C the bottom (in the back) becomes hot, and when the cpu reaches 60+ C it's boiling. Maybe it is the longer heat pipe. Non of the thermal modes are making much of a different or changing the fan activity. reducing the cpu to 80-99% only helps a little. Also it's not possible to control the fan through bios or hwinfo64.
Any ideas on how to control the fan?

 

The panel I have is the AUO B156HW01 V1 although Dell usually use two sources (the other may be the Samsung panel mentioned here).

I consider it to be excellent. Excellent viewing angles, no bleeding, no graininess and quite good colour rendering. My Spyder 4 Express calibrator reported this and showed there was a slight blue bias.

I've not noticed any flicker even on minimum brightness.

John

 

Thank you for your answers! Would you say that the white color is yellow tinge or dirty effect?

John, in the future you will do a detailed review of the laptop?

 

That minimum fan speed is the same as mine. I thought the trigger temperature is around 65C. However, the bottom of my computer stays below 40C but perhaps I haven't encountered an operating condition where the CPU sustains around 60C (ie hot, but not hot enough to get the fan running). Unfortunately, I don't think there is a program which controls fans on the current Dell notebooks. Once upon a time (about 15 years ago) someone did figure out how to do this and wrote a program called I8kFanGUI, but more recently Dell changed something.

While the 2200 rpm fan speed is quiet, it does appear that Dell could usefully add an additional, slower, fan speed which cuts in at around 60C. This could be included in a BIOS update. You may want to raise your problem in the Dell support forum where it should get Dell's attention. While there are some Dell technical people signed up to the NBR forum they don't appear to be very active.

John