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1) Message boards : Number crunching : GPU overheating (Message 105136)
Posted 1622 days ago by Profile SteveRCProject donor
What you (and all other aspiring Laptop GPU Crunchers) need... is..

This pic shows my Dell Latitude E5570 laptop Tthrottle graph over 12 hours last night..
You can see while GPU sits below 70degC, the CPUs are pushing into the high 80s..
This is because they share the same heatsink, but thermal transfer is much better for the GPU, so it sits much closer to the Heatsink temp.
The graph shows a wealth of interesting information..
- each 'tick'(heartbeat?) on those CPU and GPU lines represents a successfully completed task! :-)
u can see the 'gap' in the readings just before 1am, when Windows rebooted to install updates :-(
After the reboot, temps shot up quite quickly, causing 2 things to happen simultaneously -
1. Tthrottle hit it's CPU temp limit, causing it to throttle the CPU tasks, (the blue DownSpikes!)
2. The Laptop also hit a thermal 'limit', causing a period of 'high-fan-revs'
This results in CPU temp dropping even lower than the usual 'steady' temps we had before midnight.. - but after a while, the laptop decides it's 'cool-enough' and switches its fan off! - causing this cycle to repeat for the next few hours.
Then around 07h30 the hot African Sun makes its appearance, requiring throttling to begin in earnest.. - Note that CPU and GPU hit limit at the same time.. (there is a small GPU throttle downspike!) - but as soon as CPUs are throttled to around 60%, heatsink temp drops and GPU can continue at full throttle!
Then just after 8am, I come in and crank-up the Aircon!
I DO have a nice, big CoolerMaster Laptop fan blasting cool air onto the base, but with that and Tthrottle, there's no reason not to let yr trusty laptop reward you with with many more 'ticks' - and hopefully another Prime before the month is out..!

It's the answer to World(GPU-Thermal)Tension!
2) Message boards : Number crunching : Badges - Full Sets! (Message 103281)
Posted 1662 days ago by Profile SteveRCProject donor
Thanx to Challenge... All back to Cool Turq..!
3) Message boards : Number crunching : Help setting up new PC (Message 102993)
Posted 1667 days ago by Profile SteveRCProject donor
I use TightVNC myself. I tried TeamViewer, but if you lose your internet connection you can't connect to the box sitting next to you. That was unacceptable. ...

Not strictly true... Teamviewer works just fine without any internet connection!

If u select [Extras] [Options] from the Teamviewer pulldown menu u will see
[Incoming LAN Connections] under [Network Settings] - which defaults to [Deactivated].

Change this to [Accept] and Teamviewer will happily connect to any local PC without any Internet connection! - simply use the PC's IP address instead of the Teamviewer ID number, and u get a fast, seamless connection with all TeamViewer's cool File-Transfer and Drag&Drop features - regardless of the state of your Internet connection!

TightVNC is fine for 'local' networks, but nothing beats Teamviewer's ability to find it's way thru Corporate Firewalls and suchlike..!!

4) Message boards : Number crunching : Disturbance (Message 100762)
Posted 1722 days ago by Profile SteveRCProject donor
Look at that prime score he's got - not going to be beaten for a while. Consider it embedded it concrete.

Mr. Brown got chopped down from spot #1 in a single prime. I am sure he will keep hunting for that tops spot again.

In a few days Mr. Brown will be number 3 in the "Top List".

Tell us more! Here is the list top users by score. /JeppeSN

I gues that the wingman will be the second on the list when he finishes the workunit... right?

(he is rocking a AMD A6-3600 APU, so it will take a while)

"She". Very reliable computer on SoBs, but also very slow. Hopefully it will complete the task, but it will take a few weeks.

By my calculation, our wingman(wingwoman?) should come yodeling in from the Swiss Alps around the 3rd of December!

.. perhaps an emailed suggestion to suspend the other 3 tasks to make it safer/faster wouldn't go amiss?
5) Message boards : Number crunching : Badges - Full Sets! (Message 96485)
Posted 1854 days ago by Profile SteveRCProject donor
Finally managed to turn all those Angry Reds to Serene Cyan. A much more restful colour after that seemingly infinite wait for SOB wingmen!!

.. and I just noticed that 300 mil!! Nice coincidence!
6) Message boards : Number crunching : Summer Solstice Challenge (Message 95939)
Posted 1864 days ago by Profile SteveRCProject donor
Already submitted a couple of tasks from my (So-Last-Season!) 4690k ... and just popped up in 10th place! ... but not likely to stay there long... wondering whether it was worth staying up till 2am...? U Bet it Was!! :-)
7) Message boards : Number crunching : Hyper threading and LLR (Message 88679)
Posted 2125 days ago by Profile SteveRCProject donor
... With HT, more circuits seems to be active on die, so temperatures are rising. If you'll occasionally get full load on all cores (esp. on Windows which runs tons of trash when computer is idle), it raises chances of bad calculation, system crash, or overheating.

While this may be true, my gut-feel is that running with HT on, and 'locking' LLR tasks to correct cores with high-priority, will ALWAYS show an improvement (however slight) over simply turning HT off and filling all cores with tasks. Mainly because those 'tons of trash' will force continual swapping of the LLR tasks in and out of the cores (with consequent loss of cache 'continuity'), which have to be shared with HT off, but there will be virtually no swapping of 'locked' LLR tasks with 'free' (HT) cores for all the trash (or sieve tasks!) to play around in.

Clearly there will be a rise in temperatures, but that's merely an indication that the cores are doing more work in less time, and therefore being more efficient!
8) Message boards : Number crunching : A test for hyper threading (Message 88469)
Posted 2132 days ago by Profile SteveRCProject donor
I think those results can be viewed as extremely encouraging - considering the Boinc scheduler is exceptionally bad at 'pairing' tasks - preferring to run them in 'batches' of all one type until they run out!
As can be seen in the experiment, the Boinc scheduler preferred to spend almost 2/3 of the core-time on the LLR tasks, which would imply using 3 cores together for LLR on average, incurring that big hyperthreading-penalty we know to be true for LLR tasks.. So even a 10% 'bonus' under these circumstances is remarkable, and I would expect a MUCH better result from a properly-paired experiment! - but clearly not so easy to manage with short tasks manually!!
9) Message boards : Number crunching : A test for hyper threading (Message 88465)
Posted 2133 days ago by Profile SteveRCProject donor
I have done some fiddling with pairing LLR and Sieve tasks in cores manually in Windows.. - this is pretty easy to do without any additional apps required.. Here's how..
.. Assuming a hyperthreaded Core-i7 (8 tasks)..
1. Download 4 (nice long!) LLR tasks.
2. Rt-Click taskbar and select Task Manager
3. Select [Processes] (Win 7-) or [Details] (Win 8+)
4. Rt-Click on each LLR task (the ones showing the sizeable CPU%!) - and set [Affinity] to a single Core (1,3,5,7) for each task respectively (I usually also set [Priority] to [Above Normal] unless i need the PC for "real" work!!!)
5. Now you can simply set Boinc to download (short!) sieve tasks and leave it to 'fill' the other available cores in the usual way..!

I worked out proper core 'pairing' with the aid of Tthrottle - which clearly shows the paired cores are.. :-
0-1 2-3 4-5 6-7 in Windows..

I would love for someone to do some definitive tests with this pairing strategy to determine whether there's any real overall gain.. - compared to simply running the (un-threaded) LLR and (hyperthreaded) Sieve tasks separately...?? - I'm afraid I'm simply too lazy/forgetful to collect the required data!
10) Message boards : General discussion : Why does PrimeGrid make my computer work so hard? (Message 88208)
Posted 2141 days ago by Profile SteveRCProject donor
Almost all Laptop fans suck air in the bottom and blow it out the side, so that's why those cooling pads that blow air up onto the bottom are very effective.. But I have found that even propping the laptop up off the table to allow free air flow around the fan intake can result in a good 5degC drop on the Tthrottle graph! - I use a large "D-cell" battery at each corner to raise it up for better airflow!

- This tends to be a great deal more effective than any "metal-tray" heatsink method... (I've tried them all!)

Don't forget a good blast of compressed air every now and again to blow out the dust!
(SHORT blasts - or jam the fan with a pin - to avoid over-spinning the fan and burning the bearings!!)

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