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OT tech: LGA771 to LGA775 MOD?



 
 
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  #1  
Old January 29th 16, 03:37 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
John Doe[_8_]
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Default OT tech: LGA771 to LGA775 MOD?

Anybody try it? Anybody have hands-on experience with it?

Otherwise, if you are a real techie, what do you think about it?

I suppose getting it to work with a consumer version of Windows is a trick.
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  #2  
Old January 29th 16, 04:09 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
John Doe[_8_]
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Default OT tech: LGA771 to LGA775 MOD?

Nevermind. I was thinking about something else, not just sticking an Xeon
CPU in an LGA 775 motherboard.
  #3  
Old January 29th 16, 08:43 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
Paul
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Default OT tech: LGA771 to LGA775 MOD?

John Doe wrote:
Nevermind. I was thinking about something else, not just sticking an Xeon
CPU in an LGA 775 motherboard.


I don't understand what your objective is right now.

Are you attempting to replace your LGA775 CPU ?

With a big budget or a little budget available ?

If I had the money to spend (which I don't, because I
bought my toy last year), I'd be getting a 4790K. You get
a decent clock speed, but finding a good motherboard
now might be a problem.

http://ark.intel.com/products/80807/...40-GHz?q=4790k

The idea is, to get something that will be your "last PC",
because the days of desktops are fast coming to a close.

You don't need a Skylake, because the substrate
bends on those.

While screwing around with a Xeon is "fun", would
you be happy with it ?

Paul
  #4  
Old January 29th 16, 10:06 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
John Doe[_8_]
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Posts: 2,378
Default OT tech: LGA771 to LGA775 MOD?

Paul wrote:

John Doe wrote:


Nevermind. I was thinking about something else, not just sticking an
Xeon CPU in an LGA 775 motherboard.


I don't understand what your objective is right now.


Are you attempting to replace your LGA775 CPU?


While screwing around with a Xeon is "fun", would you be happy with
it?


Have you tried using a dual CPU server for video or gaming?

You can double the L3 cache by using to Xeon CPUs. Of course it doubles
the core count too, FWIW. More importantly might be what a dual CPU
setup does for motherboard memory bandwidth. I would guess it doubles
the number of channels. And of course one needs to find a board that
reasonably supports a modern video card.

The more fiddling and construction it takes the better. Would help
explain why everybody isn't already doing it. And there are tons of
secondhand server CPUs and motherboards. There will be some sacrifices,
but that's all part of the design.

Here's a cool YouTube video on the subject...

https://www.youtube.com/watch?v=epIlB49SNTI

I love how he cuts up his $500 video card. Should have used a miter saw.
He mentioned some of the pitfalls, that's great stuff.

I'm trying to figure out which motherboard to use. I guess that's where
I would start, right? It needs to be obsolete in order to meet my
budget. This is what I got concerning the LGA 771 versus the LGA 1366...

The Intel® Xeon® processors that use a socket 771 share a common
microarchitecture with the Intel Core™ 2 Duos and Intel Core 2 Quads.
The socket 1366 is used on the 1st generation Intel Core i7’s and the
Intel Xeon 5500’s and 5600’s processor. The biggest reason for the
change in pins between these sockets is the integration of the memory
controller and support for triple channel memory that the processors
that used socket 1366 would take advantage of.

Too bad we can't just stick dual Q9550s on one motherboard. But
apparently there are a equivalent Xeon CPUs, for cheap.




--

By the way... A Canadian is doing well at the Australian open, in case
you know about that sort of thing. But he is facing Andy Murray in the
semifinal, starting about now I think.
  #5  
Old January 29th 16, 10:14 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
edevils
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Default OT tech: LGA771 to LGA775 MOD?

On 29/01/2016 08:43, Paul wrote:
....
The idea is, to get something that will be your "last PC",
because the days of desktops are fast coming to a close.

You don't need a Skylake, because the substrate
bends on those.

....


Yep!
The original report is in German
http://www.pcgameshardware.de/Luftku...-1179237/2/#a6

but Arstechnica explains
http://arstechnica.co.uk/gadgets/201...party-coolers/
"...Certain third-party CPU coolers could damage Skylake CPUs and
motherboards thanks to Skylake's thinner construction, according to a
report by German tech website Games Hardware. In independent testing,
the site found that the pressure exerted by some popular coolers caused
the structurally weaker Skylake CPU to bend, thus damaging the
motherboard's delicate pins and contacts."



  #6  
Old January 29th 16, 10:34 PM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
Paul
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Posts: 18,275
Default OT tech: LGA771 to LGA775 MOD?

John Doe wrote:


Have you tried using a dual CPU server for video or gaming?


http://www.cpubenchmark.net/high_end_cpus.html

https://www.cpubenchmark.net/multi_cpu.html

Intel Xeon E5-2698 v3 @ 2.30GHz 22,309
[Dual CPU] Intel Xeon E5-2698 v3 @ 2.30GHz 30,217

30,217 / 22,309 = 1.35x (versus expecting 2x)

And note that games will be worse, due to the "boss process"
thread running one core flat out, and the other cores run
at around 30%. In such situations, clock rate is king.
I would rather have a 4GHz 4790K than a 2.3GHz Xeon in that case,
as at least the boss thread uses the whole 4GHz of its core.

There are a few games that have symmetric loading. Fritz Chess
might be symmetric. And one strategy game (without heavy
graphics), I think that one is symmetric too. But for many
others, the main game thread is dominant, favoring a processor
selected for its high clock.

There are some reasonable Xeons, perhaps 4 core with clocks
over 3GHz. Which might help if you wanted to go this way in
building a gaming machine. The Xeons with more cores than that
and lower clock rates, are intended for server applications with
many many independent execution threads.

I wasn't able to find a really decent collection of gaming
benchmarks featuring dual socket motherboards. Anandtech
has some, but there's a strong correlation to "GPU limit"
on the selected games, rather than "CPU limit". So when it
came to spotting a trend, in one case the 4790K happened
to be at the top of the chart, and other times, a dual
Xeon was at the top. And this can happen, as the span of
frame rate differences is only a few frames per second.

And sometimes you'll spot anomalies, where two processors
have the same architecture, and the slower processor wins,
implying not enough care perhaps setting up the gaming
initial conditions. To bench games, sometimes you have to
do several "warm up" runs to get consistency, and treat
each test case with the same care (i.e. install backup
copy of OS to make it "fresh", reboot, run warmup #1,
run warmup #2, do real benchmark). Because the frame rates
aren't separated by that much, the entries in the chart
tend to trade places.

Only the totally outclassed processors (Intel Atom),
fall down to the bottom of the chart where they belong.

HTH,
Paul
  #7  
Old January 30th 16, 06:16 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
John Doe[_8_]
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Posts: 2,378
Default OT tech: LGA771 to LGA775 MOD?

Paul wrote:

I wasn't able to find a really decent collection of gaming benchmarks
featuring dual socket motherboards.


They won't have reviews that few people are interested in. Apparently
there are extremely few ATX dual socket motherboards, at skyhigh prices.

This isn't only for gaming. And besides servers, there are also
workstations that include dual socket motherboards.

I found at least one dual socket legacy motherboard that looks great for
the cause. The Intel S5000XVNSATAR LGA771. Here is its supported CPUs...

http://ark.intel.com/products/46538/...@compatibility

It has only a first generation x16 PCIe slot, but that's better than the
x8 slot in the YouTube tutorial I referenced earlier.

Intel 1366 motherboards seem to be less suitable, and apparently no
longer after that Intel got out of the motherboard business.

Might need to buy a dirt cheap CPU (lots on eBay) if necessary to update
the bios before buying a decent but still inexpensive CPU. Might want to
buy a lesser pair first anyway since a spare can be used for troubleshooting.
And it will be good for getting my feet wet (and a clue).

Super cheap so far. Memory looks reasonable. Memory appears
to be a serious problem with some legacy dual socket motherboards.






--

Anandtech
has some, but there's a strong correlation to "GPU limit"
on the selected games, rather than "CPU limit". So when it
came to spotting a trend, in one case the 4790K happened
to be at the top of the chart, and other times, a dual
Xeon was at the top. And this can happen, as the span of
frame rate differences is only a few frames per second.

And sometimes you'll spot anomalies, where two processors
have the same architecture, and the slower processor wins,
implying not enough care perhaps setting up the gaming
initial conditions. To bench games, sometimes you have to
do several "warm up" runs to get consistency, and treat
each test case with the same care (i.e. install backup
copy of OS to make it "fresh", reboot, run warmup #1,
run warmup #2, do real benchmark). Because the frame rates
aren't separated by that much, the entries in the chart
tend to trade places.

Only the totally outclassed processors (Intel Atom),
fall down to the bottom of the chart where they belong.

HTH,
Paul


  #8  
Old January 30th 16, 07:40 AM posted to alt.comp.os.windows-8,alt.comp.os.windows-10
John Doe[_8_]
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Posts: 2,378
Default OT tech: LGA771 to LGA775 MOD?

Looks like the motherboard (new, retail box), CPUx2 (used), and 8 GB of
memory will cost about $140 US.

Intel S5000XVNSATAR motherboard

Intel Xeon L5420 2.50Ghz Quad Core 12M Cache 1333MHz LGA771 (50 watts)

Memory appears to be plentiful.

Using a GTX 960.
 




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