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Old 2011-12-15, 15:10   #1
Dubslow
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Default P-1 Memory?

Just wanna get this straight:
Which is better for P-1 throughput or effectiveness?

8GB DDR3 1600 or 16GB DDR3 1333?

Or would an extra $50 for 8GB 1600 vs. 8GB 1333 make a difference?

Last fiddled with by Dubslow on 2011-12-15 at 15:17
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Old 2011-12-15, 15:49   #2
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Quote:
Originally Posted by Dubslow View Post
Just wanna get this straight:
Which is better for P-1 throughput or effectiveness?

8GB DDR3 1600 or 16GB DDR3 1333?

Or would an extra $50 for 8GB 1600 vs. 8GB 1333 make a difference?
AFAIK, if you are on a 64-bit system, 16 GB would be better than 8GB (higher probability to find a factor).

If, instead, with throughput you intended speed of the test, I would opt for 8GB DDR3 1600.

Luigi
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Old 2011-12-15, 17:41   #3
Dubslow
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Well that's what I mean, throughput is open to whatever interpretation helps GIMPS. How much a speedup would the extra frequency get versus the extra 8GB? Would the extra probability on 16 GB be worth more than sped-up 8 GB with extra bandwidth?
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Old 2011-12-15, 18:40   #4
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Quote:
Originally Posted by Dubslow View Post
Well that's what I mean, throughput is open to whatever interpretation helps GIMPS. How much a speedup would the extra frequency get versus the extra 8GB? Would the extra probability on 16 GB be worth more than sped-up 8 GB with extra bandwidth?
IMHO, yes, you'd have a higher probability to get a factor with 16GB than with a higher speed 8GB. But I am answering from my GIMPS experience more than mathematical background.

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Old 2011-12-15, 18:48   #5
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Quote:
Originally Posted by Dubslow View Post
Just wanna get this straight:
Which is better for P-1 throughput or effectiveness?

8GB DDR3 1600 or 16GB DDR3 1333?

Or would an extra $50 for 8GB 1600 vs. 8GB 1333 make a difference?
((8GB DDR3 1600 or 16GB DDR3 1333?) == (8GB DDR3 1600 or 2*8GB DDR3 1333?) == (8GB DDR3 1600 or 8GB DDR3 2666?)) ?
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Old 2011-12-15, 20:27   #6
Dubslow
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What? When have I ever mentioned 2666? Is there even such a specification?
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Old 2011-12-15, 20:43   #7
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Quote:
Originally Posted by Dubslow View Post
What? When have I ever mentioned 2666? Is there even such a specification?
One can only assume it was a joke
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Old 2011-12-15, 20:50   #8
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Quote:
Originally Posted by Dubslow View Post
What? When have I ever mentioned 2666? Is there even such a specification?
not sure. I was just saying that 16 gb going at 1333 Mhz is like 8 going at 2666 Mhz memory usage wise at least from my naive point of view.
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Old 2011-12-15, 20:56   #9
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Quote:
Originally Posted by science_man_88 View Post
not sure. I was just saying that 16 gb going at 1333 Mhz is like 8 going at 2666 Mhz memory usage wise at least from my naive point of view.
Why not running 1GB at 21328 MHz?
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Old 2011-12-15, 21:06   #10
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Code:
64MiB
[Work thread Dec 15 14:54] Optimal P-1 factoring of M50323751 using up to 64MB of memory.
[Work thread Dec 15 14:54] Optimal bounds are B1=585000, B2=585000
[Work thread Dec 15 14:54] Chance of finding a factor is an estimated 1.94%

128MiB
[Work thread Dec 15 14:55] Optimal P-1 factoring of M50323751 using up to 128MB of memory.
[Work thread Dec 15 14:55] Optimal bounds are B1=400000, B2=2600000
[Work thread Dec 15 14:55] Chance of finding a factor is an estimated 2.89%

256MiB
[Work thread Dec 15 14:56] Optimal P-1 factoring of M50323751 using up to 256MB of memory.
[Work thread Dec 15 14:56] Optimal bounds are B1=460000, B2=5865000
[Work thread Dec 15 14:56] Chance of finding a factor is an estimated 3.5%

512MiB
[Work thread Dec 15 14:57] Optimal P-1 factoring of M50323751 using up to 512MB of memory.
[Work thread Dec 15 14:57] Optimal bounds are B1=475000, B2=8312500
[Work thread Dec 15 14:57] Chance of finding a factor is an estimated 3.76%

1024MiB
[Work thread Dec 15 14:58] Optimal P-1 factoring of M50323751 using up to 1024MB of memory.
[Work thread Dec 15 14:58] Optimal bounds are B1=490000, B2=9187500
[Work thread Dec 15 14:58] Chance of finding a factor is an estimated 3.85%

2048MiB
[Work thread Dec 15 14:59] Optimal P-1 factoring of M50323751 using up to 2048MB of memory.
[Work thread Dec 15 14:59] Optimal bounds are B1=485000, B2=9578750
[Work thread Dec 15 14:59] Chance of finding a factor is an estimated 3.87%

4096MiB
[Work thread Dec 15 15:00] Optimal P-1 factoring of M50323751 using up to 4096MB of memory.
[Work thread Dec 15 15:00] Optimal bounds are B1=490000, B2=9800000
[Work thread Dec 15 15:00] Chance of finding a factor is an estimated 3.89%

8192MiB
[Work thread Dec 15 15:01] Optimal P-1 factoring of M50323751 using up to 8192MB of memory.
[Work thread Dec 15 15:01] Optimal bounds are B1=490000, B2=9922500
[Work thread Dec 15 15:01] Chance of finding a factor is an estimated 3.9%

16384MiB
[Work thread Dec 15 15:02] Optimal P-1 factoring of M50323751 using up to 16384MB of memory.
[Work thread Dec 15 15:02] Optimal bounds are B1=490000, B2=9922500
[Work thread Dec 15 15:02] Chance of finding a factor is an estimated 3.9%
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Old 2011-12-15, 21:30   #11
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Quote:
Originally Posted by kar_bon View Post
Why not running 1GB at 21328 MHz?
Now you are just being silly! Everyone knows that would create interference for allot of electronics in your house... From the toaster to the dishwasher, probably also the water-heater, although I'm not sure about that one!
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