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AMD HD 6770 x2 VS. SIngle AMD R9 270X

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  • 6770
  • AMD
  • HD
  • Graphics
Last response: in Graphics & Displays
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September 13, 2014 12:56:49 AM

Hi Guys,
I already own a HD 6770 card, but now i want to upgrade my gpu.
So should i go for R9 270X? or get another 6770 and crossfire it with my existing one?
Also should i be worried about any bottlenecks?
And should i overclock my cpu?

My PC Config.:
CPU: AMD FX 8320
RAM: Corsair Vengeance 4GB x2 = 8GB @ 1600MHz
GPU: MSI HD 6770
PSU: Corsair VS550 @ 550W
Motherboard: Gigabyte GA 970A DS3P
Cabinet: Cooler Master k281 mid tower
Samsung 840 EVO SSD for OS and Games.

More about : amd 6770 single amd 270x

a b À AMD
September 13, 2014 12:59:49 AM

In MMOs an overclock could be beneficial (they strongly prefer Intel CPUs), but otherwise you're fine.

If your HD 6770 is 1GB (it probably is?) then I'd get the R9 270X.
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September 13, 2014 1:03:31 AM

Rationale said:

If your HD 6770 is 1GB (it probably is?) then I'd get the R9 270X.

Yes its 1GB.
And Thanks for your reply.
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September 13, 2014 1:08:06 AM

An R9-280 3 GB card will be a better upgrade. But if that's beyond your budget, then the R9-270X 2 GB is still a nice upgrade.
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a b À AMD
September 13, 2014 1:08:57 AM

a single 270X is faster than 2 6770. your PSU have no problem using 270X
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a b À AMD
September 13, 2014 1:10:23 AM

Your card has 1GB of VRAM, so crossfire is not necessarily going to help you achieve higher resolutions or detail settings.
Not all games support crossfire.
When it does work, it adds 60 to 70% performance over a single card (not double as you might expect).
The second PCI-E x16 slot on your motherboard operates at only x4 speed.
For all these reasons, I suggest you just buy a single better card.

With your power supply, the fastest cards you can go to are the Radeon R9 270X or GeForce GTX 760.
In some games the R9 270X is faster, but on average the GTX 760 is faster.
http://www.tomshardware.com/reviews/radeon-r9-280x-r9-2...
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a b À AMD
September 13, 2014 3:34:41 AM

Joseph DeGarmo said:
An R9-280 3 GB card will be a better upgrade. But if that's beyond your budget, then the R9-270X 2 GB is still a nice upgrade.


Do not try to run an R9 280 with this power supply.
The VS-550 is only rated at 42A on the +12V rail.
It is also not a great quality supply and may not be able to deliver the rated current.

With the FX-8320 and an R9 280 you would be over 80% load on the +12V rail, without overclocking.
Overclocking the CPU will make the situation even worse.

An R9 207X or GTX 760 is as high as you should go on this power supply.
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September 13, 2014 5:27:18 AM

Then get the GTX 760. It requires 500w and 30 amps on 12v rail to run. You should get the 4 GB version if you can.
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a b À AMD
September 13, 2014 4:38:27 PM

Joseph DeGarmo said:
Then get the GTX 760. It requires 500w and 30 amps on 12v rail to run. You should get the 4 GB version if you can.


These are just rough guidelines from Nvidia on a recommended power supply, trying to cover a range of possible system configurations and power supplies.
The FX-8320 is a power hog with a TDP of 125W.
The GTX 760 is rated at 170W TDP (R7 270X is rated at 180W).
Allow 40W for other components.

To run this system with the GTX 770 you would want a good quality supply rated at least 35A on the +12V rails, or 36A with the R9 270X (up to 80% load on the +12V rails).
For a supply like the VS series where rated output is more questionable, I would recommend 40A with the GTX 770 or 41A with the R9 270X (up to 70% load on the +12V rails).
VS-550 is rated at 42A on the +12V rail, so it is suitable for these cards.

I only mention this because there are plenty of 500W power supplies with a +12V rating of over 30A that could not reliably run this system with a GTX 760 or R7 270X.

The 4GB version is a nice to have, but it is a fair bit more expensive than the 2GB version.
The only game I've seen use more than 2GB VRAM at 1920x1080 resolution is Skyrim with mods and this was resolved by disabling MSAA.
Get the 4GB version if it is affordable, but it won't make a big difference.
This card is mostly useful for SLI, where two GTX 770 cards in SLI can run at high resolutions (2560x1440, 5760x1080, 3840x2160) but more than 2GB of VRAM is required per card.
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