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dick balaska <dic### [at] buckosoft com> wrote:
> > Do you have a link? There are some good deals at BB in a "salvage parts
> > from an old PC to help build a new one" sense. I.e. I have an SSD and
> > graphics card already that I could put into one of these machines.
I could fill several 4-foot cubes with all the motherboards, HDD's, memory, etc
that we have here.
Whole pallets of towers, SFF, USDT, laptops, servers, ....
> Pretty weird. This is the box I bought, the link is from my history.
> But, I did *not* pay $800 with monitor. I would have gone for a lesser
> machine.
Let me know if you need anything, and I can see what we've got that is or is not
currently listed. I don't have any control over the pricing or negotiations,
but it's _gotta_ be cheaper than brand new from Best Buy.
And I can hand pick and pack.
http://www.cecent.com/
https://www.ebay.com/usr/cecet
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On 08/23/2018 06:15 AM, dick balaska wrote:
> On 08/23/2018 06:07 AM, dick balaska wrote:
>
>>
>>
https://www.bestbuy.com/site/dell-inspiron-desktop-intel-core-i5-12gb-memory-1tb-hard-drive-black-with-silver-trim/6228201.p?skuId=6228201
>>
>
> "Smart six-core, twelve-way processing performance"
> No it doesn't.
>
> $ cat /proc/cpuinfo
> vendor_id : GenuineIntel
> model name : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
> cpu MHz : 3799.999
> cache size : 9216 KB
> siblings : 6
> cpu cores : 6
>
>
> My 4 core / 8 thread i7
> $ cat /proc/cpuinfo
> vendor_id : GenuineIntel
> model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
> cpu MHz : 3492.055
> cache size : 8192 KB
> siblings : 8
> cpu cores : 4
>
I came across an article a while back about Intel dropping
hyper-threading in favor of cores at the lower end. Looks like yours is
one of those processors!
More cores is better for POV-Ray so this no threading more cores change
helps us - and especially in v3.8 over v3.7 given it's threads > cores
performance has slowed more than threads <= cores has (6% vs about 3%
last I did any measures).
Note that your i5-8400 has a turbo frequency of 'up to' 4GHz throttled
by temperature. Many other processors have the turbo option too though
often it's not a much higher frequency than the normal in older
generations. If turbo mode is not off turned off in bios, performance
measures to 'clock time' can be all over the place - better to measure
hardware cycles and even there you need to be sure you are not thrashing
your caches with other work for example.
My little i3-4130 doesn't have the turbo mode which makes timing
relative to the 'clock' a little more reliable.
Well, excepting starting earlier this year when measured time seemed to
get more unstable. Has me wondering about possible impacts for some of
those security patches for metldown and specter exposures - but I've
done no digging. Might be I'm just timing different features of POV-Ray
of late that have different register and cache usage patterns.
Aside: This is the first I've noticed /proc/cpuinfo having bug
information. Mine shows:
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
Any of those gone on your i5-8400?
Bill P.
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On 8/23/2018 6:07 AM, dick balaska wrote:
> Pretty weird. This is the box I bought, the link is from my history.
> But, I did *not* pay $800 with monitor. I would have gone for a lesser
> machine.
>
> Technically, the machine is for the 6 year old to play minecraft. :)
>
>
https://www.bestbuy.com/site/dell-inspiron-desktop-intel-core-i5-12gb-memory-1tb-hard-drive-black-with-silver-trim/6228201.p?skuId=6228201
>
This one is slightly cheaper:
https://www.bestbuy.com/site/hp-pavilion-desktop-amd-ryzen-5-series-12gb-memory-1tb-hard-drive-ash-silver/6221040.p?skuId=6221040
It has 4 cores/8 threads, so it might be better for POV-Ray.
Also the APU in the new AMD PCs are supposed to be good. However, I
haven't yet found a way to directly compare this APU with my old GeForce
GTX 750 TI. If the APU is better then I might buy this PC.
Mike
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dick balaska <dic### [at] buckosoftcom> wrote:
> I've noticed a Ghz decrease in my last couple of boxes. From 3.4Ghz to
> 3.0Ghz and now 2.8Ghz. Certainly that will run "cooler".
> The box is in the living room and is silent, as opposed to my i7 which
> has dual fans that have a teeth-floating harmonic.
Dual fans? Does it overclock? Overclocking is a disqualifier for me; it
increases the risk of frying the CPU without providing any long term advantages
for a ray tracer.
But I can't live without my hyper-threading, so my next box will surely be
another i7.
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Am 23.08.2018 um 20:33 schrieb Cousin Ricky:
> But I can't live without my hyper-threading, so my next box will surely be
> another i7.
Not necessarily. IIRC Intel has just recently started to introduce
hyperthreading into the i5 class of CPUs.
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On 8/23/2018 4:03 PM, clipka wrote:
> Am 23.08.2018 um 20:33 schrieb Cousin Ricky:
>
>> But I can't live without my hyper-threading, so my next box will surely be
>> another i7.
>
> Not necessarily. IIRC Intel has just recently started to introduce
> hyperthreading into the i5 class of CPUs.
>
I thought the i5s always used hyperthreading?
Mike
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On 8/23/2018 4:03 PM, clipka wrote:
> Am 23.08.2018 um 20:33 schrieb Cousin Ricky:
>
>> But I can't live without my hyper-threading, so my next box will surely be
>> another i7.
>
> Not necessarily. IIRC Intel has just recently started to introduce
> hyperthreading into the i5 class of CPUs.
>
https://en.wikipedia.org/wiki/List_of_Intel_Core_i5_microprocessors#Westmere_microarchitecture_(1st_generation)
1st generation i5s featured hyperthreading according to Wikipedia.
Mike
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Am 24.08.2018 um 01:48 schrieb Mike Horvath:
> On 8/23/2018 4:03 PM, clipka wrote:
>> Am 23.08.2018 um 20:33 schrieb Cousin Ricky:
>>
>>> But I can't live without my hyper-threading, so my next box will
>>> surely be
>>> another i7.
>>
>> Not necessarily. IIRC Intel has just recently started to introduce
>> hyperthreading into the i5 class of CPUs.
>>
>
> I thought the i5s always used hyperthreading?
From what I'm finding on the internet, you're right in that i5 with
hyperthreading did exist previously, but only in 2-core (physical) models.
With Generation 8(?), Intel has apparently re-introduced HT to i5.
Reliable sources? Can't find any ad-hoc. Would have to dig through a
list of CPUs. No fun, no do.
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On 08/23/2018 02:33 PM, Cousin Ricky wrote:
> dick balaska <dic### [at] buckosoftcom> wrote:
>> I've noticed a Ghz decrease in my last couple of boxes. From 3.4Ghz to
>> 3.0Ghz and now 2.8Ghz. Certainly that will run "cooler".
>> The box is in the living room and is silent, as opposed to my i7 which
>> has dual fans that have a teeth-floating harmonic.
>
> Dual fans?
Dual fans here means actually three fans. :) One on the power supply,
one on the case, and one on the CPU. All three are different speeds and
make for some irksome high frequency harmonics.
> Does it overclock? Overclocking is a disqualifier for me; it
> increases the risk of frying the CPU without providing any long term advantages
> for a ray tracer.
Any overclocking I do is provided by official intel. I.e. the new i5
overclocks itself. "turbo mode"
model name : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
cpu MHz : 3799.999
The thing has been running flat out for a week. I expected it to
slowdown when it got warm.
>
> But I can't live without my hyper-threading, so my next box will surely be
> another i7.
I don't know, man. I like my i7, but this new i5 is *fast*.
I reran a scene and this is the number of frames that each contributed:
name frames % of total
contrib
james 1275 32.93 # i5-8400 @ 2.8GHz (6 cores 6 threads)
cyd 789 20.38 # i7-4770 @ 3.4Ghz (4 cores, 8 threads)
joe 701 18.10 # i5-7400 @ 3.0GHz (4 cores) (2017 box)
ringo 618 15.96 # i5-4460 @ 3.2GHz (4 cores) (2015 box)
liza 489 12.63 # i5-3330 @ 3.0GHz (4 cores) (2013 box)
That scene ran for 8 days and the new i5 was only up for 6 days. I'd bet
the next scene he gets close to 40% of the total work.
--
dik
Rendered 920576 of 921600 pixels (99%)
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On 08/23/2018 11:07 AM, William F Pokorny wrote:
> Aside: This is the first I've noticed /proc/cpuinfo having bug
> information. Mine shows:
>
> bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
>
> Any of those gone on your i5-8400?
They are the same set.
The i7 is different:
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
Last years box:
model name : Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
My oldest box is running ubuntu 14 / linux 3.13 (as opposed to linux
4.4) and does not report the bugs.
>
> Bill P.
--
dik
Rendered 920576 of 921600 pixels (99%)
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