R9 295x2 8gb + 290x 8gb tri CF

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bromchild84

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Hi I currently have an R9 295x2, love it, great card. I read that there may be scaling issues etc if I was to add another R9 295x2 (4xCF) but if I added a 290x (3xCF) it would scale and also perform very well with far less issues than Quadfire.

Basically I've decided I'm going to get a 290x but would it make a difference if I got the 8gb version? Or would it be pointless and should I just get the 4gb version? If there was going to be any type of improvement I would definitely get the 8gb version.

Currently at 1440p (PLS Monitor oc'd 85htz) but will either be going to 4k sometime soon, want to wait for a price drop in the IPS 4k panels.

Many thanks

Eric
 
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Salvinha
Yes, there is no problem in a crossfire of a dual and single card, but as said, the memory will be the lesser commom denominator, 4GB in this case.
Remember that when in a crossfire the memories don't add each other, GPUs in crossfire/sli only mirror their memories, making it faster of course.
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emdea22

emdea22

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This smells like trouble :))

When using Xfire/SLI your usable vram is the lowest common denominator. In your case will be 4gb so no, you shouldn't get the 8gb version. You should make sure your crazy config works before buying the card - i haven't heard anybody doing what you're trying to do.
 
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Salvinha

Salvinha

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Yes, there is no problem in a crossfire of a dual and single card, but as said, the memory will be the lesser commom denominator, 4GB in this case.
Remember that when in a crossfire the memories don't add each other, GPUs in crossfire/sli only mirror their memories, making it faster of course.
 
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bromchild84

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Thanks, yeah I just wasn't sure as the R9 295x2 is 8gb, like you say though its really 2 x 4gb. I will get the 4gb R9 290x Tri-X OC I think. Should be a rather nice setup once its done.

I've currently have a Seasonic X-Series 1050w PSU, should I get a slightly more powerful PSU do you think?

Thanks again
 
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Salvinha

Salvinha

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I assume that your computer setup is a monster kill, well, if you ever think about overclocking anything or if you have a hex-core CPU such as I7 5xxx k instead of a I7 4xxx K you should get a stronger PSU. If not, your PSU will hold well (but on the edge).
The 295x2 and 290x has 500w tdp and 290w tdp respectively (on load), 790w TDP only for your videocards.
I would get a stronger PSU just to be safe, that way you could be safe for a possible overclocking (although your computer won't need it in years) and a "breathing" PSU.
 
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bromchild84

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Specs are:

Asus PB278Q 27-Inch 1440p PLS Monitor (Oc'd 85htz),
i7 3770k OC'd 4.7ghz,
Noctua NH-D14,
Asus P8Z77-V Premium (BIOS 2104)
16gb 1600mhz Corsair Ram
R9 295x2 8gb OC'd Core Clock 1100mhz, Memory Clock 1400mhz
Asus Xonar D2X
Seasonic XSeries 1050w
Samsung 830 Pro 256gb SSD (OS Windows 8.1)
Crucial MX100 520gb SSD
32gb SSD built in to mobo
2tb Seagate HDD
LG Blu-ray drive
2.4 & 5ghz Wifi Card
NZXT Phantom Full tower (3 x 120mm fans, 1 x 140mm fan and 3 x 200mm fans)

Yeah I think your right, to be safer I may well get a 1200w or 1350w

Based on my specs would it be safe enough to start with the X Series 1050w I've got now or would that be dangerous and should I get a new PSU before installing the new card?

Thanks again for your replies
 
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Salvinha

Salvinha

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Wow, 3 SSDs, really? I wished I could do that, unfortunatelly in my country things are pretty expensive...

Man, I think it is safe getting a new PSU before the card, because now your 295x2 can run any game in Ultra with monster FPS, so no need for other card now, it may come later.

PS: According to MS, DX 12 will rise all cards performance like no other, DX 12 cards will get around 100%, and DX 11 around 40%, I think these are pretty exagerated figures but I have hope.
This is the motive I didn't change my HD 7950 yet, it supports DX 12, I wanna see what is going to happen. :)

Congratulations for your computer, a very good one.
 
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