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Old 2020-08-20, 13:42   #1
a1call
 
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Default Dual Processors

Hey all,
According to my AI sidekick Windows 10 supports 2 processors and 2 TB of RAM.
However my search of Newegg or ibuypower fails to find any motherboards housing more than 1 CPU or 128 GB of memory.

Any suggestions for a maximize-able motherboard or would you have to wire up one yourself?

Would a dual processor Windows 10 double-up the available cores/threads of a single CPU?

Thanks for your time and insight.
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Old 2020-08-20, 13:50   #2
Uncwilly
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Newegg has dual socket motherboards: https://www.newegg.com/p/pl?d=dual+socket+motherboard#

This one allows 1TB of RAM: https://www.newegg.com/supermicro-mb...quicklink=true
and this one too: https://www.newegg.com/asus-z11pa-d8...-062-_-Product

When using 2 CPU's you want to keep all threads for a single worker on a single CPU.

Last fiddled with by Uncwilly on 2020-08-20 at 13:53
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Old 2020-08-20, 13:56   #3
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Quote:
Originally Posted by a1call View Post
Hey all,
According to my AI sidekick Windows 10 supports 2 processors and 2 TB of RAM.
However my search of Newegg or ibuypower fails to find any motherboards housing more than 1 CPU or 128 GB of memory.

Any suggestions for a maximize-able motherboard or would you have to wire up one yourself?

Would a dual processor Windows 10 double-up the available cores/threads of a single CPU?
Ebay or other sources offer used dual-Xeon workstation or server grade hardware with ECC ram, which offers great primality test reliability. Dual-quad up to dual-12 with HT, possibly higher, depending on budget limits. Being workstations, they will include an old gpu or two to play with too, not having motherboard-based video. I have a dual-12-HT Lenovo running two prime95 workers. A single Radeon VII gpu will beat its cpus' throughput handily though. Which fortunately it can support also. If you anticipate replacing the power supply I suggest caution on the HP Z series, which has oddly shaped power supplies. The systems can be found very economically though. https://www.ebay.com/itm/HP-Z600-Wor...O/224114675494
https://www.ebay.com/itm/HP-Z840-WOR...O/174312836624
(I've had Z600s for years and no power supply failures yet. Z600 doesn't have the power cables for a Radeon VII, but Z820 or up does as I recall.) Lenovo has standard form factor power supplies.
So far I've not found 128GB or even 24 or 12 to be too limiting in prime95. Four workers can all tackle P-1 stage 2 with allowed 30GB each at the same time in a 128GB. There seems to be some performance advantage to staggering stage 2 execution on a cpu package though.

Last fiddled with by kriesel on 2020-08-20 at 14:13
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Old 2020-08-20, 15:07   #4
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I believe that only the 'pro' or 'entreprise' version of W10 allow this. Familly version only allow 128GB.

Last fiddled with by firejuggler on 2020-08-20 at 15:14
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Old 2020-08-20, 20:37   #5
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Quote:
Originally Posted by kriesel View Post
Z600 doesn't have the power cables for a Radeon VII
What kind of power cables and PCI slots does the Z600 have?
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Old 2020-08-20, 23:07   #6
a1call
 
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Quote:
Originally Posted by Uncwilly View Post
Newegg has dual socket motherboards: https://www.newegg.com/p/pl?d=dual+socket+motherboard#

This one allows 1TB of RAM: https://www.newegg.com/supermicro-mb...quicklink=true
and this one too: https://www.newegg.com/asus-z11pa-d8...-062-_-Product

When using 2 CPU's you want to keep all threads for a single worker on a single CPU.
Thank you very much for the links. I will search some more myself but so far they seem to be Intel chip compatible which I assume would max at 24-threads@12-cores.
When I go to the US site it suggests that I go to the Canadian site which seems quite different.
Anywho I am considering a Ryzen 32-Threads@16-cores for now.
Thanks for all the replies and helps.
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Old 2020-08-20, 23:24   #7
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Quote:
Originally Posted by firejuggler View Post
I believe that only the 'pro' or 'entreprise' version of W10 allow this. Familly version only allow 128GB.
Appreciate the heads up on that.
I am planning on getting a non-OEM pro version.
there seems to be something strange going on with the Newegg computer builder site. Yesterday it was offering a 16-core Ryzen. Today it was showing a 64-Core Ryzen and now both are gone and the maximum cores are 12.

Probably a database update or something.
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Old 2020-08-20, 23:47   #8
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Quote:
Originally Posted by kriesel View Post
Ebay or other sources offer used dual-Xeon workstation or server grade hardware with ECC ram, which offers great primality test reliability. Dual-quad up to dual-12 with HT, possibly higher, depending on budget limits. Being workstations, they will include an old gpu or two to play with too, not having motherboard-based video. I have a dual-12-HT Lenovo running two prime95 workers. A single Radeon VII gpu will beat its cpus' throughput handily though. Which fortunately it can support also. If you anticipate replacing the power supply I suggest caution on the HP Z series, which has oddly shaped power supplies. The systems can be found very economically though. https://www.ebay.com/itm/HP-Z600-Wor...O/224114675494
https://www.ebay.com/itm/HP-Z840-WOR...O/174312836624
(I've had Z600s for years and no power supply failures yet. Z600 doesn't have the power cables for a Radeon VII, but Z820 or up does as I recall.) Lenovo has standard form factor power supplies.
So far I've not found 128GB or even 24 or 12 to be too limiting in prime95. Four workers can all tackle P-1 stage 2 with allowed 30GB each at the same time in a 128GB. There seems to be some performance advantage to staggering stage 2 execution on a cpu package though.
Thanks for the insights kriesel.
I have a preference for new items even if they are inferior to something cheaper but used.
I am running the risk of spending more money than I can really afford by trusting a computer builder app that might end up being a disaster to put together.
A bit of risk makes life more interesting I guess.

BTW When I search for "dual sockets" in the Newegg Computer-Builder site I get:

Quote:
We’re sorry, there are no items that match your selections. Please adjust your selections to try again.
But they are available in the general search function.
Makes it more risky to get without the app's auto compatibility check.

ETA I am planning to get the cheapest GPU I can. The main Prime related software I use are Pari and PFGW which I believe do not have any GPU-calculation capabilities.

Last fiddled with by a1call on 2020-08-20 at 23:55
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Old 2020-08-21, 00:37   #9
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Quote:
Originally Posted by a1call View Post
BTW When I search for "dual sockets" in the Newegg Computer-Builder site I get:
Did you try it without the S on the end?
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Old 2020-08-21, 00:52   #10
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Quote:
Originally Posted by Uncwilly View Post
Did you try it without the S on the end?
I thought I did but apparently not so.
Thanks again Mr.
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Old 2020-08-21, 02:47   #11
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So it appears that the PC-Builder at Newegg has "Sort-by", "Featured-items" as default which is why things appear and disappear at times. Sorting by other criteria such as "Best-Rating" or what have you generates a completely different list. You can verify this by sorting by clicking on the Title-Tabs such as "Fan-RPM" for liquid-cooling systems which will have completely different lists for different "Sort-By" pull-downs. Somewhat problematic to use.
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