Crossfire question

[timh1995]

Had an odd question that might not even work. I currently am running an r9 270 2 gb from sapphire and its great. My old card is an xfx radeon hd 7750 1 gb and it just collecting dust. My question is can I use my old card as a boost to my r9 270? Or is that just not possible?

[AresKrieger]

It's not possible, xfire works with cards of the same design (for example 290 and 390 should work together) but the 7750 isn't the same chip design so it can't work.

[007agentHP]

no

the 7750 runs on the Cape Verde Chip

the R9 270 is Pitcarin i believe

 

you can, but it will slow down your 270 to 7750 speeds

[timh1995]

Just now, AresKrieger said:

It's not possible, xfire works with cards of the same design (for example 290 and 390 should work together) but the 7750 isn't the same chip design so it can't work.

Alright. thanks for the reply =)

[timh1995]

59 minutes ago, 007agentHP said:

no

the 7750 runs on the Cape Verde Chip

the R9 270 is Pitcarin i believe

 

you can, but it will slow down your 270 to 7750 speeds

So essentially it comes down to this. The r9 270 has 1280 shading units and 20 compute units vs 512 SU and 8 CU. What you are saying is if I were to crossfire them the r9 270 would only allow the same spec usage as the hd 7750?

[007agentHP]

33 minutes ago, timh1995 said:

So essentially it comes down to this. The r9 270 has 1280 shading units and 20 compute units vs 512 SU and 8 CU. What you are saying is if I were to crossfire them the r9 270 would only allow the same spec usage as the hd 7750?

not the same spec usage but the same performance as a radeon 7750

but the thing is the R9 270 is more than twice as fast as the Radeon 7750

even in perfect crossfire scaling, youd loose performance. i'd sell the 7750

 

[SpaceGhostC2C]

41 minutes ago, timh1995 said:

So essentially it comes down to this. The r9 270 has 1280 shading units and 20 compute units vs 512 SU and 8 CU. What you are saying is if I were to crossfire them the r9 270 would only allow the same spec usage as the hd 7750?

Your R9 270 is an HD 7850, it won't work in CrossFireX with the 7750.

You can have a look at the compatible CrossFireX setups accordign to AMD itself. Just remember to make the proper conversion from R7 or R9 2XX and the HD 7XXX models:

 

-7770/7790 = R7 260/260X

-7850/7870 = R9 270/270x

-7950/7970 = R9 280/280x

[-rascal-]

49 minutes ago, timh1995 said:

So essentially it comes down to this. The r9 270 has 1280 shading units and 20 compute units vs 512 SU and 8 CU. What you are saying is if I were to crossfire them the r9 270 would only allow the same spec usage as the hd 7750?

 

11 minutes ago, 007agentHP said:

not the same spec usage but the same performance as a radeon 7750

but the thing is the R9 270 is more than twice as fast as the Radeon 7750

even in perfect crossfire scaling, youd loose performance. i'd sell the 7750

 

 

What?!

You simply CANNOT even run a R9-270 with a HD 7750 in Crossfire -- even if you throw them both into a single computer, and hook up a Crossfire Bridge between them.

As mentioned they are using a completely separate GPU micro-architecture -- the number of shaders or compute units won't matter.

 

Crossfire only works with GPUs that use the same GPU core.

 

You can Crossfire a HD 7750 with anything other graphics card that is based on 'Cape Cerde'.

• HD 7700
• Another HD 7750
• HD 7730
• R7-260X
• R7-260
• R7-250X / 250E

 

As for the R9-270, it uses the 'Pitcarin' core.

• R7-370X
• R7-370
• Another R9-270
• R9-270X
• HD 7870 (all variants; excluding the 7870 XT)
• HD 7850

 

[007agentHP]

2 minutes ago, -rascal- said:

 

 

What?!

You simply CANNOT even run a R9-270 with a HD 7750 in Crossfire -- even if you throw them both into a single computer, and hook up a Crossfire Bridge between them.

As mentioned they are using a completely separate GPU micro-architecture -- the number of shaders or compute units won't matter.

 

Crossfire only works with GPUs that use the same GPU core.

 

You can Crossfire a HD 7750 with anything other graphics card that is based on 'Cape Cerde'.

• HD 7700
• Another HD 7750
• HD 7730
• R7-250X / 250E

 

As for the R9-270, it uses the 'Pitcarin' core.

• R7-370X
• R7-370
• Another R9-270
• R9-270X
• HD 7870 (all variants; excluding the 7870 XT)
• HD 7850

 

you dont know the looseness of crossfire

 

the cores are the same, they are just cut down

same way people run Rx 470 and Rx 480s in crossfire, you can run a 7750 and a 7850 in crossfire

i've in the past run a 7870 GHZ edition with an r9 280x

[-rascal-]

7 minutes ago, 007agentHP said:

you dont know the looseness of crossfire

 

the cores are the same, they are just cut down

same way people run Rx 470 and Rx 480s in crossfire, you can run a 7750 and a 7850 in crossfire

The HD 7700 series and HD 7800 series uses two separate GPU architectures.

I've ran ATi / AMD Crossfire since the Radeon HD 2000 series...

 

 

EDIT: For future references, these charts are directly from AMD's website. Not the most up-to-date, but still "a" resource.

http://support.amd.com/en-us/kb-articles/Pages/Crossfire-Chart.aspx

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