juandante

I expressively locked GPU at 1247 Mhz because it seems the base frequency of the CPU is related to the base frequency of the GPU. I read this some time ago when the Ivy Brigde has just been released. In the Intel GPU control panel, I set "plugged in" and "on battery" to "maximum performance", and in consequence instead the base frequency of CPU is not anymore 1200 Mhz and 650 Mhz for the GPU, is goes up to 2200 Mhz minimum and 1247. In low performance, I just tested, the idle temp goes from 74 to 62°C but the max temp is still 103°C. Good to know this tip for idle temp. But I wonder how do you manage 87°C on CPU stress test with 8 threads - 4 cores. This seems way to good. I read you use stock 2560p heatsink, is this all ? I repasted my CPU (with clean CPU surface and everything) many many times but this didn't change anything. Also I never hit 103°C, it is only in real CPU stress test like Prime95, CPU-Z stress test, or 7z compression, that I reach this temps but it is still very far from the 87°C. Also, I almost never hit my max turbo at 3700 Mhz, my "mean max turbo" is more like 3400 Mhz (measured with HWMonitor) so I lost a lot of performance from the ideal 3820qm (but still 2x more than my previous dual core previous generation 2620m). I just bench marked, I lose like 10% to 15% of performance from 3700 Mhz to 3400 Mhz full 4-cores 8-threads maxed out. I recognize also that there are a lot of people that have hard times reaching the max turbo on all platforms but this seems very low, I should stabilise the temps from 103 to 60°C (70°C maximum) on load to have average max turbo at 3700 Mhz, which seems impossible with such small heat-sink, heat-pipe, and radiator.

Running a 2570p with a i7 3820qm since 2-3 months. The temperature is NORMAL at 48-55°C on Windows 10 with the core parking feature. Basically the 3820qm with the core parking, is running as a dual core, until I open a heavy application. On Windows XP, the temps are INSANE. At least on Windows XP : I am at 60°C with fan at 3200 rpm lowest settings, but the least of application I open like net browsing and it goes up at 75°C. Previously, with an i7 2620M on XP, I had 74°C with fan off, but above all, 3.5W in idle or internet usage, on the 3820qm I am at 8-9W on idle and internet usage, always on XP. On Windows 10, I run at 3.5W in average. Now, this is only for simple Internet browsing. When I do slightly more heavy work, for example multitasking, with ALL cores (so same as on Windows 10 or Windows XP), I go up to... 103°C minimum. The CPU throttles. And the fan is on MAX. And it still stays at 103°C. On the i7 2620m I use to go down to 74°C with max fan and max cores. I estimated the i7 3820qm CPU, without throttling, would reach 130°C with the heatsink. Conclusion : the heat-sink of 2570p is just to small for a 45W CPU. BUT, VERY IMPORTANT, even with the throttling, I get a clear boost (2x more scores in multi-thread benchmark, about 1.15x in mono-thread, even with throttling fully enabled) in computer speed. BUT, second BUT, the CPU is not on is max possibilities. I need a way to extract the 30-40°C additional heat to have the max possibilities of CPU. Also, it is, at least for the Ivy Bridge, important to use the latest OS for the core parking, but for work purpose I have to use the old Windows XP. The only way I found to remove the 30-40°C additionnal heat is to plug a flexible heat pipe under the CPU and stick it to a copper plate under the fan. Here is the link for the flexible heat pipe : https://www.ebay.fr/sch/i.html?LH_PrefLoc=2&_sop=15&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xflexible+cpu+heat+pipe.TRS0&_nkw=flexible+cpu+heat+pipe&_sacat=0&_oac=1 I tested also the 2560p heatsink : no real improvements. I had my 3820qm at a very good price (only 110 euros, still expensive for a 4-5 years old CPU and still was the best price), but seriously, 45W is 45W don't need to choose between 3720qm or whatever, just choose the cheapest one available at the time in your country zone. I would take the 35W quad-core i7, it is very very cheap, and will not heat so much. In reality, the heat is not a problem, cause when I plug the 2570p on a monitor and keyboard the power of this laptop make anyone forget it is a laptup. But the metal case of the 2570p makes the heat diffuse everywhere and is very uncomfortable to use in hands.