Re: [LAU] New workstation | DAW pc

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To: rosea grammostola <rosea.grammostola@...>
Cc: linux-audio-user <linux-audio-user@...>
Date: Thursday, September 9, 2010 - 4:36 pm

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On 5 September 2010 21:18, rosea grammostola wrote:

>

Arrandale i5-750 you get 4 cores (but no hyperthreading or GPU) instead of 2
cores with hyperthreading plus on-chip GPU. You can see the equivalent
Anandtech review for Arrandale at http://www.anandtech.com/show/2832 . If
you compare the benchmarks in the review you quoted, the i5-750 has a
Sysmark score of 217 versus 204 for the i3-540, which is only a 6%
difference. However, if you look at multiple benchmarks (see Tom's hardware
comparison chart
http://www.tomshardware.co.uk/charts/desktop-cpu-charts-2010/compare,2414.html?prod[4483]=on&prod[4487]=on(which
is for i5-530, not i5-540 but is still relevant)) the differences are
often much greater. In particular, if you look at the Adobe Photoshop Image
processing benchmark, which is the only one that I know is definitely using
parallel processing on all available cores, then the 4 core processor is
twice as fast (unsurprisingly). My expectation is that as time goes on more
and more compute-intensive applications (such as audio and video encoding
and compiling) will start to use multiple cores fully, so it makes sense to
buy for the future.

Another factor is memory bandwidth; assuming that some audio work is memory
intensive (in particular playback using large sample banks) then I think
this is important. The i5-750 has a memory bandwidth of 16.9 GB/s vs. 11.6
for the i3-530 (from the comparison chart); this is a 46% improvement.
Compounding this is the fact that the onboard GPU is using main memory as
video memory, so that memory bandwidth is also being shared with all the
video data, which could eat up a large chunk of the capacity. So the i5 must
come out way ahead on memory bandwidth available for the CPU.

Thirdly, you can get cheap fanless video cards with far better performance
with the onboard GPU and no uncertainty about whether they work with the
real-time kernel (but ask what models are tested, I remember hearing that
some of the proprietary drivers also caused problems it the RT kernel).

My philosophy is to let the CPU do processing, and the video card handle
video with its own separate memory that doesn't compete with the CPU;
combining the two can only lead to compromises.

Fritz

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On 5 September 2010 21:18, rosea grammostola <rosea.grammostola=
@gmail.com
> wrote:

Thanks for the info. After some reading=
and discussion, the i3 or i5 seems to be good options indeed. After re=
ading this: http://www.anandtech.com/show/2901/7 and considering my budget

It looks like I better go for a i3 540 or something close to that, compared=
to a i5...My perspective on the pro=
cessors is a little different. If you go for the Arrandale i5-750 you get 4=
cores (but no hyperthreading or GPU) instead of 2 cores with hyperthreadin=
g plus on-chip GPU. You can see the equivalent Anandtech review for Arranda=
le at http=
://www.anandtech.com/show/2832
. If you compare the benchmarks in the r=
eview you quoted, the i5-750 has a Sysmark score of 217 versus 204 for the =
i3-540, which is only a 6% difference. However, if you look at multiple ben=
chmarks (see Tom's hardware comparison chart http://www.tomshardware.co.uk/=
charts/desktop-cpu-charts-2010/compare,2414.html?prod[4483]=3Don&prod[4=
487]=3Don
(which is for i5-530, not i5-540 but is still relevant)) the =
differences are often much greater. In particular, if you look at the Adobe=
Photoshop Image processing benchmark, which is the only one that I know is=
definitely using parallel processing on all available cores, then the 4 co=
re processor is twice as fast (unsurprisingly). My expectation is that as t=
ime goes on more and more compute-intensive applications (such as audio and=
video encoding and compiling) will start to use multiple cores fully, so i=
t makes sense to buy for the future.

Another factor is memory bandwidth; assuming that some audio work is me=
mory intensive (in particular playback using large sample banks) then I thi=
nk this is important. The i5-750 has a memory bandwidth of 16.9 GB/s vs. 11=
.6 for the i3-530 (from the comparison chart); this is a 46% improvement. C=
ompounding this is the fact that the onboard GPU is using main memory as vi=
deo memory, so that memory bandwidth is also being shared with all the vide=
o data, which could eat up a large chunk of the capacity. So the i5 must co=
me out way ahead on memory bandwidth available for the CPU.

Thirdly, you can get cheap fanless video cards with far better performa=
nce with the onboard GPU and no uncertainty about whether they work with th=
e real-time kernel (but ask what models are tested, I remember hearing that=
some of the proprietary drivers also caused problems it the RT kernel).

My philosophy is to let the CPU do processing, and the video card handl=
e video with its own separate memory that doesn't compete with the CPU;=
combining the two can only lead to compromises.Fritz

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Messages in current thread:
[LAU] New workstation | DAW pc, rosea grammostola, (Fri Sep 3, 8:59 am)
Re: [LAU] New workstation | DAW pc, Mark Knecht, (Sat Sep 4, 7:54 pm)
Re: [LAU] New workstation | DAW pc, rosea grammostola, (Mon Sep 6, 2:01 pm)
Re: [LAU] New workstation | DAW pc, Mark Knecht, (Mon Sep 6, 5:44 pm)
Re: [LAU] New workstation | DAW pc, Ken Restivo, (Tue Sep 7, 2:26 am)
Re: [LAU] New workstation | DAW pc, rosea grammostola, (Sun Sep 5, 7:18 pm)
Re: [LAU] New workstation | DAW pc, Fritz Meissner, (Thu Sep 9, 4:36 pm)
Re: [LAU] New workstation | DAW pc, rosea grammostola, (Thu Sep 9, 6:26 pm)
Re: [LAU] New workstation | DAW pc, david, (Sun Sep 5, 10:40 pm)