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Jacob R

40 cores and 32gb of ddr3 for $800?!?!?!

Those processors are so cheap because they're old and power hungry and can only achieve the high frequencies when only a few cores are used. Once more than a few cores are used, the process will sit mostly at the lower frequency.


So your e7 2870 will be at 2.4ghz to 2.8 ghz and has a TDP of 130w, therefore two of those will use up to around 300 watts of power when you give them something to do. Compare that to modern processors that need 65 to 95w of power.

 

As a performance comparison, 2 x E7-2850 ( 2 x 10 core / 20 threads  at 2.0Ghz .. 2.4 Ghz) in total have the same performance of a single Ryzen 5 1600 which needs only 65w to work.  They're so old.

 

They were a good choice for companies which licensed software per physical CPU and where the license cost of the software was way more than the price of the cpu... the cpu was good if you needed those 20 threads.

 

As for why there aren't processors running at very high frequencies? That's mostly limits of physics... speed of light and speed of electricity.  The speed of electrons flowing through "wires" is limited to slightly below the speed of light, which is almost 300,000k km/s or 186282 miles per second. 

The higher the frequency, the smaller time electrons have to go from one place in a processor to another place, at speeds like 5 Ghz distances like half an inch are just too long. In order to reach very high frequencies processors have to be made in such ways that at any point, signals travel extremely small distance, and that's increasingly hard on modern processors that have a lot of transistors.

This is the reason cpu designers segment processors in individual cores running at reasonable frequencies like 3..4 Ghz because it's much easier to make small "islands" inside the processor, where at any point high speed signals only have to travel very small distances.

 

It would relatively easy  to make processors like Intel Atom (very simple design inside, very small size) run at speeds like 8..10 Ghz , but that won't translate in super high performance ... a modern 6-8 core 3 Ghz processor will still run around it.

 

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Posted · Original PosterOP

So I was surfing the web (like we all do) and I found some extremely cheap 10 core xeons. So it got me thinking, is it possible to make a 40 core gaming and/or rendering PC? and for less than $1000???? So I started to put a list together on PC Part Pickers website and this is what I found so far. https://pcpartpicker.com/list/BJXfTH I am half way curious to see if this would work and what score in Cinabench. I would go out and buy this, but as a high school student it is hard to "throw away" $$$.


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Bad IPC.


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Posted · Original PosterOP

So would that make it a bad idea all together?


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The E7-2870 is from Q2, 2011, I wouldn't expect it to perform as well as some more modern options would.


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Posted · Original PosterOP

like how bad?? like a 40 cores/80 threads = i5-7600k?


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Games do not profit from a large number of cores, they need fast cores. So in most games you do not have better performance than with 4 cores, maybe even 2. Those CPUs are only worth it if you have a server or something similar that gets thousends of different tasks handed to it in parallel.

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11 minutes ago, Jacob R said:

like how bad?? like a 40 cores/80 threads = i5-7600k?

Most games don't use more than 4 cores/8 threads so it'd be like a low clock i7 from 2011.

 

But for video editing it would be pretty insane.

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Posted · Original PosterOP

The cinabench score!
 

 


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Just now, Jacob R said:

So why dont we all just use 10ghz dualcores??

 

Because nobody can make a CPU with that high of a clock speed yet. 

 

Without liquid nitrogen of course, but that's impractical for normal usage.

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Just now, Jacob R said:

So why dont we all just use 10ghz dualcores??

 

  1. Show me those 10Ghz dualcores, I'd like one :)
  2. You cannot compare old Ghz values to new ones. The IPC (instructions per clock, how much can the CPU do with one Hz) got better over time
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Posted · Original PosterOP

call me dumb, but if we can get 10 cores at 3ghz can't we get 8 less cores and like 4x speed?? or is it just manufactures are not aimed at souly speed?


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Posted · Original PosterOP

I am learning so much! :) and this is why i joined!


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1 minute ago, Jacob R said:

call me dumb, but if we can get 10 cores at 3ghz can't we get 8 less cores and like 4x speed?? or is it just manufactures are not aimed at souly speed?

The fact that it was not possible is one of the reasons manufactures build multi core CPUs. If you manage to do so there is a lot of money for you to earn ;)

CPUs got too hot and needed to much power at high clock speeds.

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2 minutes ago, Jacob R said:

call me dumb, but if we can get 10 cores at 3ghz can't we get 8 less cores and like 4x speed?? or is it just manufactures are not aimed at souly speed?

Each core is the same, so a core that can reach 3GHz will reach 3GHz regardless if there's 10 or 2.

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Posted · Original PosterOP
Just now, Schakal_No1 said:

The fact that it was not possible is one of the reasons manufactures build multi core CPUs. If you manage to do so there is a lot of money for you to earn ;)

CPUs got too hot and needed to much power at high clock speeds.

So, if we move away from silicone and go towards something like steel we could get a lot more warmer and faster?


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Just now, ShadowTechXTS said:

Each core is the same, so a core that can reach 3GHz will reach 3GHz regardless if there's 10 or 2.

Not quite. If you have multiple cores at high clock speed on the same die it often cannot take the amps / heat which is why cpus with very high core count often have a bit lower frequency and overclockers sometimes disable cores.

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1 minute ago, Jacob R said:

So, if we move away from silicone and go towards something like steel we could get a lot more warmer and faster?

maybe so or maybe we find a solution that does not produce that much heat. Time will tell.

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Just now, Schakal_No1 said:

Not quite. If you have multiple cores at high clock speed on the same die it often cannot take the amps / heat which is why cpus with very high core count often have a bit lower frequency and overclockers sometimes disable cores.

I know, but it's easier to explain that most of the time a core of the same architecture will perform within a margin of error of eachother regardless of count.

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1 minute ago, Jacob R said:

So, if we move away from silicone and go towards something like steel we could get a lot more warmer and faster?

silicon, silicone is entirely different. anyway even as a rendering machine it wouldn't be great, most programs don't effectively use more than like 12 cores...or threads, or some junk. anyway just not worth it


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Posted · Original PosterOP
1 minute ago, Cyracus said:

silicon, silicone is entirely different. anyway even as a rendering machine it wouldn't be great, most programs don't effectively use more than like 12 cores...or threads, or some junk. anyway just not worth it

Ok case close. Thanks to everyone who help me with my second(?) ever post.


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not a gaming rig

and you can't run four E7-2870's they support only dual socket.

you need and E7-4xxx chip for quad socket


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I'd save up and just buy a R7 system then be done with the hassle. Where you going to find a cheap case for that motherboard anyway? 


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Posted · Original PosterOP
Just now, Megah3rtz said:

I'd save up and just buy a R7 system then be done with the hassle. Where you going to find a cheap case for that motherboard anyway? 

Ever heard of Cardboard? xD JK LOL


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Like others have said, games only use 8 threads, maybe 10-12 threads max, and since single-thread performance isn't good on those CPUs, then it wouldn't be the beast you're envisioning.

 

however, it would be insane for video editing, rendering, etc.

it would also be okay for gaming, but only 5 of those 40 cores would be used. (so you could do some streaming or something with no performance hit)

if you're looking only for gaming, them less, higher-power cores are better. something like a Ryzen 5 1600 or even i7 7700K would absolutely wipe the floor against this thing in gaming performance.


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