....and even when the cooling is ok, the low profile form factor dictates the use of fans with smaller diameter, which means higher revs....more noise.
OK, rework is done, the i3 resides now in an mini tower case.
For testing purposes I moved the GTX550 from the A8 to the i3 where a x16 slot is available (in the A8 only a x8 slot was available).
Wow, what a difference in speed, ~ 20% faster!
So the 128bit memory interface of the GT640 can also be the cause of the poor performance of this card. Which means, for the final solution I will look for a card with at least 256bit interface or better a 384bit-interface (HD7950 cards), This is at least as important as clock speed. And very important if one wants to run two wu's simultanous.
in the beginning of this thread my host was mentioned (GT 640 with AMD E-350). I want to give you some informations about it:
This machine was a low power, dedicated host for BRP tasks (I even bought it for that as my contribution to science :) ). It ran BRP tasks for 13.5 hours every day (cron triggered) with 3 tasks in parallel. RAC was between 5000 and 5500, so when running 24/7 RAC would have been at about 9000. Power consumption was only about 60 watts when crunching.
Recently I've upgraded the processor / mobo to an Intel Celeron G530, because tasks were definitely slowed down by the CPU (which is Nettop hardware!) and/or the bus (only PCIE 2.0 4x).
With that upgrade, tasks are now faster - and system is still usable to do other jobs as well. It still only needs about 68 Watts now with some undervolting, so the increase of power consumption is less than the increase of performance. Yes, these Sandy Bridge processors are way more efficient than everything that AMD can offer.
I've upgraded it 2 week ago and need to use it for other things next week, so RAC is building up slowly. But I expect something around 7000 to 8000 at the end (running 13.5 hours per day).
So one will question why not using a more efficient card... the answer is that I use it as a home server as well and wanted to cap overall power consumption, because here in Germany electricity is becoming more and more expensive :)
I'm running a GT640 as a E@H cruncher. It's been running a few weeks now and RAC has reached 10,609, running four concurrent WUs. Below is some of the details.
ID: 5481492
Details | Tasks
Cross-project stats:
BOINCstats.com Free-DC gpgpu 10,609.38 523,135 7.0.27 GenuineIntel
Intel(R) Pentium(R) D CPU 2.80GHz [Family 15 Model 6 Stepping 2]
(2 processors) NVIDIA GeForce GT 640 (134215679MB) Linux
3.2.0-29-generic
....and even when the cooling
)
....and even when the cooling is ok, the low profile form factor dictates the use of fans with smaller diameter, which means higher revs....more noise.
Cheers
HBE
OK, rework is done, the i3
)
OK, rework is done, the i3 resides now in an mini tower case.
For testing purposes I moved the GTX550 from the A8 to the i3 where a x16 slot is available (in the A8 only a x8 slot was available).
Wow, what a difference in speed, ~ 20% faster!
So the 128bit memory interface of the GT640 can also be the cause of the poor performance of this card. Which means, for the final solution I will look for a card with at least 256bit interface or better a 384bit-interface (HD7950 cards), This is at least as important as clock speed. And very important if one wants to run two wu's simultanous.
Hi, in the beginning of
)
Hi,
in the beginning of this thread my host was mentioned (GT 640 with AMD E-350). I want to give you some informations about it:
This machine was a low power, dedicated host for BRP tasks (I even bought it for that as my contribution to science :) ). It ran BRP tasks for 13.5 hours every day (cron triggered) with 3 tasks in parallel. RAC was between 5000 and 5500, so when running 24/7 RAC would have been at about 9000. Power consumption was only about 60 watts when crunching.
Recently I've upgraded the processor / mobo to an Intel Celeron G530, because tasks were definitely slowed down by the CPU (which is Nettop hardware!) and/or the bus (only PCIE 2.0 4x).
With that upgrade, tasks are now faster - and system is still usable to do other jobs as well. It still only needs about 68 Watts now with some undervolting, so the increase of power consumption is less than the increase of performance. Yes, these Sandy Bridge processors are way more efficient than everything that AMD can offer.
New host is processing 2 tasks in parallel and can be found here:
http://einsteinathome.org/host/5731078
I've upgraded it 2 week ago and need to use it for other things next week, so RAC is building up slowly. But I expect something around 7000 to 8000 at the end (running 13.5 hours per day).
So one will question why not using a more efficient card... the answer is that I use it as a home server as well and wanted to cap overall power consumption, because here in Germany electricity is becoming more and more expensive :)
I'm running a GT640 as a E@H
)
I'm running a GT640 as a E@H cruncher. It's been running a few weeks now and RAC has reached 10,609, running four concurrent WUs. Below is some of the details.
ID: 5481492
Details | Tasks
Cross-project stats:
BOINCstats.com Free-DC gpgpu 10,609.38 523,135 7.0.27 GenuineIntel
Intel(R) Pentium(R) D CPU 2.80GHz [Family 15 Model 6 Stepping 2]
(2 processors) NVIDIA GeForce GT 640 (134215679MB) Linux
3.2.0-29-generic