Crossfire 2x Sapphire Radeon 7770 with 500W PSU

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Kisamegr

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I know this has been posted many times in the past, and I've been searching the web the last couple of days, but I wanted to be sure before doing anything irreversible.

So, a friend of mine is selling his old Sapphire 7770, and I already have one installed. Instead of buying a new card (like he does) and spending >200$ getting it, I was thinking the cheaper solution of the crossfire.

Cutting into the point, my rig has:
CPU: Intel i5 750 oced @3.00GHz
PSU: Thermaltake TR2 QFan Series v2.3 @500W (Specs:http://tw.thermaltake.com/db/pictures/modules/PDT/PDT060207001/20087220115082981.zip)
GPU: Sapphire Radeon 7770 @1000MHz
Motherboard: GIGABYTE P55M-UD2
Storage: 2 HDD, 1 SSD All internal

What do you guys think? Can it support the 2 GPUs or is it already too crowded in there?

The thought of underclocking the GPUs for less power consuption also crossed my mind. Is it a viable solution?

Thanks in advance!
 
Solution
clutchc
According to http://www.realhardtechx.com/index_archivos/Page362.htm
...a 520W PSU is recommended for dual HD-7770s. But it will actually depend on the +12V rail's rating more than the total wattage. And I personally would not try pushing the TR2 PSU. That is rated as one of the poorest units sold. In the 5th tier, the Not Recommended tier in this evaluation: https://community.newegg.com/eggxpert/computer_hardware/f/135081/t/45344.aspx?Redirected=true

The other drawback you have is the motherboard. It's 2nd PCIe x16 slot is only 4 lane electrically, instead of 16: http://www.gigabyte.com/products/product-page.aspx?pid=3287#sp
That will hinder performance and scaling. There is another drawback too; low end cards like those usually...
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clutchc

clutchc

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According to http://www.realhardtechx.com/index_archivos/Page362.htm
...a 520W PSU is recommended for dual HD-7770s. But it will actually depend on the +12V rail's rating more than the total wattage. And I personally would not try pushing the TR2 PSU. That is rated as one of the poorest units sold. In the 5th tier, the Not Recommended tier in this evaluation: https://community.newegg.com/eggxpert/computer_hardware/f/135081/t/45344.aspx?Redirected=true

The other drawback you have is the motherboard. It's 2nd PCIe x16 slot is only 4 lane electrically, instead of 16: http://www.gigabyte.com/products/product-page.aspx?pid=3287#sp
That will hinder performance and scaling. There is another drawback too; low end cards like those usually don't scale well in CF. Micro stutter seems to rear its ugly head as a result.

I guess it sounds like I'm tearing down your system. I don't mean to be. I just wanted to give you as much information as possible before making the move. Personally, I would opt for a new single gfx card like the GTX 960. Fastest card you can use with that PSU.
 
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K

Kisamegr

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Nov 2, 2015
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On the contrary, that was the answer I was expecting to hear. I was just hoping for the borderline pass. I also didn't know about the 2nd PCIe drawback, thanks for pointing that out.

And thanks for the time you spent searching for this!
 
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