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Message boards : Number crunching : Does PCI-E 8x vs. 16x matter?

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Profile Jordan Romaidis
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Joined: 11 May 17
Posts: 213
ID: 880615
Credit: 665,580,114
RAC: 575
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 2 primes in the 2020 Tour de PrimesFound 1 mega prime in the 2020 Tour de PrimesFound 1 prime in the 2020 Tour de Primes Mountain StageFound 1 mega prime in the 2020 Tour de Primes Mountain Stage321 LLR Ruby: Earned 2,000,000 credits (4,574,478)Cullen LLR Ruby: Earned 2,000,000 credits (2,080,460)ESP LLR Gold: Earned 500,000 credits (502,325)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,000,054)PPS LLR Emerald: Earned 50,000,000 credits (91,797,317)PSP LLR Bronze: Earned 10,000 credits (23,710)SoB LLR Sapphire: Earned 20,000,000 credits (39,985,666)SR5 LLR Jade: Earned 10,000,000 credits (16,535,456)SGS LLR Jade: Earned 10,000,000 credits (18,555,210)TRP LLR Gold: Earned 500,000 credits (525,711)Woodall LLR Jade: Earned 10,000,000 credits (15,028,246)321 Sieve Amethyst: Earned 1,000,000 credits (1,084,376)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (23,296,981)AP 26/27 Double Silver: Earned 200,000,000 credits (225,955,184)GFN Double Bronze: Earned 100,000,000 credits (146,137,103)PSA Emerald: Earned 50,000,000 credits (52,891,089)
Message 121316 - Posted: 23 Oct 2018 | 0:12:27 UTC
Last modified: 23 Oct 2018 | 1:00:45 UTC

Is there any performance degradation on crunching running 8x rather than 16x for a multi GPU setup?

Profile mikey
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Joined: 17 Mar 09
Posts: 1193
ID: 37043
Credit: 505,275,473
RAC: 14,930
Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,038,739)Cullen LLR Ruby: Earned 2,000,000 credits (2,074,615)ESP LLR Ruby: Earned 2,000,000 credits (2,013,823)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,142,353)PPS LLR Turquoise: Earned 5,000,000 credits (5,149,318)PSP LLR Ruby: Earned 2,000,000 credits (2,049,284)SoB LLR Amethyst: Earned 1,000,000 credits (1,043,824)SR5 LLR Ruby: Earned 2,000,000 credits (2,053,250)SGS LLR Turquoise: Earned 5,000,000 credits (5,095,282)TRP LLR Ruby: Earned 2,000,000 credits (2,025,737)Woodall LLR Amethyst: Earned 1,000,000 credits (1,872,972)321 Sieve Sapphire: Earned 20,000,000 credits (23,770,672)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (944,431)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,813,253)PPS Sieve Double Silver: Earned 200,000,000 credits (339,648,557)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,446,797)AP 26/27 Sapphire: Earned 20,000,000 credits (33,140,471)GFN Sapphire: Earned 20,000,000 credits (36,492,550)PSA Sapphire: Earned 20,000,000 credits (20,457,430)
Message 121326 - Posted: 23 Oct 2018 | 11:39:12 UTC - in response to Message 121316.

Is there any performance degradation on crunching running 8x rather than 16x for a multi GPU setup?


No not really, yes a tiny amount but not enough to worry about. The odd invalid unit once in awhile will wipe out any difference and then some.

Profile KyleProject donor
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Joined: 1 Jun 14
Posts: 43
ID: 315843
Credit: 5,362,071
RAC: 68
321 LLR Bronze: Earned 10,000 credits (48,756)Cullen LLR Bronze: Earned 10,000 credits (20,704)ESP LLR Bronze: Earned 10,000 credits (43,542)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (74,656)PPS LLR Silver: Earned 100,000 credits (221,025)PSP LLR Bronze: Earned 10,000 credits (27,208)SoB LLR Bronze: Earned 10,000 credits (60,097)SR5 LLR Bronze: Earned 10,000 credits (51,260)SGS LLR Bronze: Earned 10,000 credits (26,822)TRP LLR Bronze: Earned 10,000 credits (53,040)Woodall LLR Bronze: Earned 10,000 credits (77,612)PPS Sieve Ruby: Earned 2,000,000 credits (2,750,736)AP 26/27 Silver: Earned 100,000 credits (105,118)GFN Amethyst: Earned 1,000,000 credits (1,743,174)PSA Bronze: Earned 10,000 credits (41,191)
Message 121363 - Posted: 24 Oct 2018 | 20:15:34 UTC

It doesn't matter because the task is sent to then processed entirely in the GPU's memory, with the system's CPU keeping things straight (non-intensively). The difference between running this and a game is that data is constantly streamed to and from the card, and a bad card will not be able to push 60 FPS, i.e.

Unless microseconds matter, then no :P

Profile sir sant
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Joined: 23 Apr 10
Posts: 80
ID: 59272
Credit: 980,558,073
RAC: 96,015
321 LLR Gold: Earned 500,000 credits (707,443)Cullen LLR Gold: Earned 500,000 credits (516,214)ESP LLR Gold: Earned 500,000 credits (702,908)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (114,788)PPS LLR Ruby: Earned 2,000,000 credits (2,684,540)PSP LLR Silver: Earned 100,000 credits (211,016)SoB LLR Gold: Earned 500,000 credits (629,206)SR5 LLR Gold: Earned 500,000 credits (547,283)SGS LLR Amethyst: Earned 1,000,000 credits (1,933,158)TRP LLR Amethyst: Earned 1,000,000 credits (1,029,655)Woodall LLR Gold: Earned 500,000 credits (626,458)321 Sieve Turquoise: Earned 5,000,000 credits (6,048,831)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,314,895)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (10,392,000)PPS Sieve Double Gold: Earned 500,000,000 credits (835,344,509)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,596,403)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,623,417)AP 26/27 Jade: Earned 10,000,000 credits (16,960,385)GFN Emerald: Earned 50,000,000 credits (69,574,965)
Message 122635 - Posted: 18 Nov 2018 | 16:57:08 UTC

I'm running two gtx 1060 3gb cards, one is running pcie speed x16 and the other is running pcie speed x4. It is due to mobos limitations. In pps sieve there is 0 difference. In ap27 there is slight difference. So no worries. In collatz and moo there is no difference. So unless something brutal is being run, there are no worries, i think.

My host: https://www.primegrid.com/show_host_detail.php?hostid=898078

Message boards : Number crunching : Does PCI-E 8x vs. 16x matter?

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