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Crossfire How does it work?

tourenious
By tourenious
in Graphics Cards
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Cards with the same graphics chips (check here: http://linustechtips.com/main/topic/222806-what-rx-200-series-card-is-what-7000-series-card/) and same amount of VRAM.

If they have different speeds (memory or whatever) the faster card will just copy the speeds of the slower card.

 

R9 380: together with another R9 380 or R9 285. There are no 4GB R9 285 cards, but there are 4GB R9 380 cards. Keep that in mind.

R9 290 or R9 390: together with another R9 290 or together with an R9 390. Be sure you have the same VRAM amounts.

 

(I believe it works like that, if someone disagrees with this, please be sure to quote me and tell me)

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

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Well you get two things on fire and then cross them and Bam crossfireTM 

 

With the new drivers AMD made it possible to crossfire last gen cards with current gen cards, so 290 and 390 should be able to crossfire but not 380 with 290 or 390 I think.

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Cards with the same graphics chips (check here: http://linustechtips.com/main/topic/222806-what-rx-200-series-card-is-what-7000-series-card/) and same amount of VRAM.

If they have different speeds (memory or whatever) the faster card will just copy the speeds of the slower card.

 

R9 380: together with another R9 380 or R9 285. There are no 4GB R9 285 cards, but there are 4GB R9 380 cards. Keep that in mind.

R9 290 or R9 390: together with another R9 290 or together with an R9 390. Be sure you have the same VRAM amounts.

 

(I believe it works like that, if someone disagrees with this, please be sure to quote me and tell me)

You can also put 290 with 390x, 390 with 390x etc.

 

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You can also put 290 with 390x, 390 with 390x etc.

You can? Oh, I didn't know you could do that.. I thought because they are different graphics chips..

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

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They're the same core (Hawaii for 290/x and 390/x, the non X uses Hawaii PRO GPU while the X version uses Hawaii XT).

 

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Two sticks on fire that cross.

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Cards with the same graphics chips (check here: http://linustechtips.com/main/topic/222806-what-rx-200-series-card-is-what-7000-series-card/) and same amount of VRAM.

If they have different speeds (memory or whatever) the faster card will just copy the speeds of the slower card.

 

R9 380: together with another R9 380 or R9 285. There are no 4GB R9 285 cards, but there are 4GB R9 380 cards. Keep that in mind.

R9 290 or R9 390: together with another R9 290 or together with an R9 390. Be sure you have the same VRAM amounts.

 

(I believe it works like that, if someone disagrees with this, please be sure to quote me and tell me)

 

 

While matching cards are required for nVidia SLI, I recall reading that Crossfire isn't that demanding, allowing you to mix and match cards. Unsure about them needing to have the same amount of VRAM (although it would make sense)

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While matching cards are required for nVidia SLI, I recall reading that Crossfire isn't that demanding, allowing you to mix and match cards. Unsure about them needing to have the same amount of VRAM (although it would make sense)

Doesnt need to have the same amount, but if you have 4GB + 2GB for exemple, you will have 2+2GB.

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Doesnt need to have the same amount, but if you have 4GB + 2GB for exemple, you will have 2+2GB.

so basically the lowest amount of VRAM you have is the amount of VRAM the crossfire will use. Good to know.

 

I'm curious if I can use an old nVidia card as a PhysX card alongside my 270x. 

Remember kids, the only difference between screwing around and science is writing it down. - Adam Savage

 

PHOΞNIX Ryzen 5 1600 @ 3.75GHz | Corsair LPX 16Gb DDR4 @ 2933 | MSI B350 Tomahawk | Sapphire RX 480 Nitro+ 8Gb | Intel 535 120Gb | Western Digital WD5000AAKS x2 | Cooler Master HAF XB Evo | Corsair H80 + Corsair SP120 | Cooler Master 120mm AF | Corsair SP120 | Icy Box IB-172SK-B | OCZ CX500W | Acer GF246 24" + AOC <some model> 21.5" | Steelseries Apex 350 | Steelseries Diablo 3 | Steelseries Syberia RAW Prism | Corsair HS-1 | Akai AM-A1

D.VA coming soon™ xoxo

Sapphire Acer Aspire 1410 Celeron 743 | 3Gb DDR2-667 | 120Gb HDD | Windows 10 Home x32

Vault Tec Celeron 420 | 2Gb DDR2-667 | Storage pending | Open Media Vault

gh0st Asus K50IJ T3100 | 2Gb DDR2-667 | 40Gb HDD | Ubuntu 17.04

Diskord Apple MacBook A1181 Mid-2007 Core2Duo T7400 @2.16GHz | 4Gb DDR2-667 | 120Gb HDD | Windows 10 Pro x32

Firebird//Phoeniix FX-4320 | Gigabyte 990X-Gaming SLI | Asus GTS 450 | 16Gb DDR3-1600 | 2x Intel 535 250Gb | 4x 10Tb Western Digital Red | 600W Segotep custom refurb unit | Windows 10 Pro x64 // offisite backup and dad's PC

 

Saint Olms Apple iPhone 6 16Gb Gold

Archon Microsoft Lumia 640 LTE

Gulliver Nokia Lumia 1320

Werkfern Nokia Lumia 520

Hydromancer Acer Liquid Z220

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Cards with the same graphics chips (check here: http://linustechtips.com/main/topic/222806-what-rx-200-series-card-is-what-7000-series-card/) and same amount of VRAM.

If they have different speeds (memory or whatever) the faster card will just copy the speeds of the slower card.

 

R9 380: together with another R9 380 or R9 285. There are no 4GB R9 285 cards, but there are 4GB R9 380 cards. Keep that in mind.

R9 290 or R9 390: together with another R9 290 or together with an R9 390. Be sure you have the same VRAM amounts.

 

(I believe it works like that, if someone disagrees with this, please be sure to quote me and tell me)

  

Well you get two things on fire and then cross them and Bam crossfireTM 

 

With the new drivers AMD made it possible to crossfire last gen cards with current gen cards, so 290 and 390 should be able to crossfire but not 380 with 290 or 390 I think.

  

You can also put 290 with 390x, 390 with 390x etc.

Has someone tested this? Because last I heard (from AMD on 390/X launch day) the 290 series was not CrossFire compatible with the 390 series.

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Has someone tested this? Because last I heard (from AMD on 390/X launch day) the 290 series was not CrossFire compatible with the 390 series.

I haven't personally tested it or know anyone who has, but I heard they first didn't enable this but later they did:

http://www.pcworld.com/article/2947402/amd-catalyst-157-drivers-secretly-unlocked-crossfire-support-between-r300-and-r200-radeon-gpus.html

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

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Has someone tested this? Because last I heard (from AMD on 390/X launch day) the 290 series was not CrossFire compatible with the 390 series.

NCIX uploaded a Netlinked daily with that as a news a few weeks ago..

 

Spoiler

|| Asrock Z68 Extreme 3 Gen 3 || i5 3570 @3.5GHz || Zalman CNPS10X Optima || 8GB RAM HyperX Fury Blue @ 1600MHz || Thermaltake Berlin 630W || Zalman Z11 || Gainward Phantom GTX 970 || 120GB Kingston V300  (Gift) + 1TB  WD Green

 

Phone: Xiaomi Redmi Note 8

Tablet: iPad Mini 2

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