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Message boards : Proth Prime Search : PCIe x16 vs PCIe x8

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RickProject donor
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Joined: 24 Aug 10
Posts: 20
ID: 66290
Credit: 180,819,463
RAC: 0
Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (4,504,681)Cullen LLR Gold: Earned 500,000 credits (521,297)PPS LLR Sapphire: Earned 20,000,000 credits (35,205,543)PSP LLR Silver: Earned 100,000 credits (217,487)SoB LLR Silver: Earned 100,000 credits (110,446)SR5 LLR Gold: Earned 500,000 credits (755,121)SGS LLR Amethyst: Earned 1,000,000 credits (1,853,121)TRP LLR Ruby: Earned 2,000,000 credits (2,294,033)Woodall LLR Silver: Earned 100,000 credits (335,400)321 Sieve Silver: Earned 100,000 credits (203,238)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,379,561)PPS Sieve Jade: Earned 10,000,000 credits (18,868,282)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (71,707)TRP Sieve (suspended) Silver: Earned 100,000 credits (218,225)GFN Emerald: Earned 50,000,000 credits (99,818,000)PSA Jade: Earned 10,000,000 credits (13,463,320)
Message 26159 - Posted: 7 Sep 2010 | 1:52:15 UTC


Hi,

I'm trying to look into the difference between PCIe x16 and PCIe x8.

Let's say someone has a motherboard that has a PCIe x16 slot and a PCIe x8 slot but if both slots are populated then both slots run at x8. Let's say someone has a GeForce GT 220 in the x16 slot and the other slot empty and has two cards that are not installed anywhere, another GeForce GT 220 and a GeForce 9600 GSO.

For PrimeGrid would someone be better off leaving the x8 slot empty so that the x16 slot can run at it's full speed or putting a card into the x8 slot and have two cards both running at x8?

Thanks,

Rick

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Profile Michael GoetzProject donor
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Found 5 primes in the 2021 Tour de PrimesFound 5 mega primes in the 2021 Tour de PrimesThe "Shut up already!" badge: This loud mouth has mansplained on the forums over 10 thousand times! Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 6 mega primesFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (3,624,591)ESP LLR Turquoise: Earned 5,000,000 credits (5,021,269)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (16,008,485)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,291,181)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,252,256)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,911,985)321 Sieve Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)GFN Emerald: Earned 50,000,000 credits (76,733,355)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 26161 - Posted: 7 Sep 2010 | 2:01:26 UTC - in response to Message 26159.
Last modified: 7 Sep 2010 | 2:02:37 UTC


Hi,

I'm trying to look into the difference between PCIe x16 and PCIe x8.

Let's say someone has a motherboard that has a PCIe x16 slot and a PCIe x8 slot but if both slots are populated then both slots run at x8. Let's say someone has a GeForce GT 220 in the x16 slot and the other slot empty and has two cards that are not installed anywhere, another GeForce GT 220 and a GeForce 9600 GSO.

For PrimeGrid would someone be better off leaving the x8 slot empty so that the x16 slot can run at it's full speed or putting a card into the x8 slot and have two cards both running at x8?

Thanks,

Rick



For PrimeGrid, the speed of the PCIe slot doesn't matter, since very little data is sent between the CPU and the GPU. You probably would not be able to measure a speed difference between running in a 1x slot vs. running in a 16x slot.

So, in your example, there would be no penalty to populating both PCIe slots with GPUs.
____________
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Message boards : Proth Prime Search : PCIe x16 vs PCIe x8

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