Confused over GPU clock speeds Radeon HD 7750

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mushibu09

mushibu09

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Jan 6, 2013
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Hello,

Now I may go with a 7770 but at moment I am looking at 7750 GPU

I have currently the HD 3870X2 - it's dying slowly. (I also have a Dell Alien ware Area 51 1000Watt PSU)

I am confused over the clock speeds like I know that GDDR5 is better than GDDR3 but the speeds are different or same or less I am confused can someone explain to me what I need to be looking for

weather;

Core Speed, Memory Speed, cores (minimum of 512), PCIe version GDDR3/5

What should I be looking for in a GPU?

Also Power is no problem.

I play basic games like Assassins Creed 1 and brotherhood, Portal 1 and 2, dragon age 1 2, Fable 1 3, and fgames like them. I do very very little After effects CS6 (only do 30s video) and I watch DVB-T

(I will be using it on new PC when I upgrde, AMD FX-6300 Asus M5A97 R2.0 and 8GB RAM Windows 7 64bit)

 
Solution
Gam3r01
Faster core speeds and memory speeds are always nice to have, at this point getting DDR3 is just shooting yourself in the foot. Only go for DDR5. Another thing to take into consideration is the bit type of the memory. For example. A 7850 has 2gb ddr5 256 bit and a 650ti has 2gb ddr5 192 bit. So the 7850 has the advantage on bandwidth.
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Gam3r01

Gam3r01

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Jan 12, 2013
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Faster core speeds and memory speeds are always nice to have, at this point getting DDR3 is just shooting yourself in the foot. Only go for DDR5. Another thing to take into consideration is the bit type of the memory. For example. A 7850 has 2gb ddr5 256 bit and a 650ti has 2gb ddr5 192 bit. So the 7850 has the advantage on bandwidth.
 
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Solution
mushibu09

mushibu09

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Jan 6, 2013
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Thank you Great to know, what about the Bandwidth, and GPixels/s? cause my current card is better there.

LEo
 
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robert_johnson

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Jul 22, 2013
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You should look at the GPU architecture( Radeon HD7770 (GCN) performs better that Radeon HD5770 (VLIW5) despite the lower cores ). Number of cores is also important (When it is 1440 vs 640). As for GDDR5 doubles the data transfer rate of GDDR3, so you should get cards with GDDR5. Look also at the bus width (128 Bit vs 256 Bit etc), larger the bus width better the data transfer rate. For the game that you indicated you should get HD7770Ghz Edition.
 
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robert_johnson

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Jul 22, 2013
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Bandwidth is the data transfer rate. It depends directly on the memory clock, memory type (GDDR5), and the bus width.
You can calculate the theoretical bandwidth by this formula:
Bandwidth = (bus width/8)*memory clock*memory type/1000 (GDDR3 = 2, GDDR5 = 4) you will get the result in GB/s

For example, for Radeon HD7770, Bandwidth = 128/8*1125*4/1000 = 72 GB/s

You can verify the result here.
http://en.wikipedia.org/wiki/Comparison_of_ATI_graphics_processing_units#Southern_Islands_.28HD_7xxx.29_Series
 
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robert_johnson

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You should look at the GPU itself for example a single Radeon HD5850 can have a better performance than Radeon HD 4870 X2, despite the better specs (bandwidth, GTexels/s ).

 
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