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5770 CF 512mb vs 5770 CF 1gb

Last response: in Graphics & Displays
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April 1, 2010 10:47:17 AM

Is there any significant difference in performance between 512mb and 1gb version of 5770 in CF? I want to build new gaming rig later this month and my favorite store has nice discount on 512mb variant (100 EUR for 512mb 5770 vs 140 EUR for 1gb 5770). I am also considering 5850 (240-270 EUR). Which setup should I get? I will be playing on 1080p display.

More about : 5770 512mb 5770 1gb

April 1, 2010 11:19:49 AM

Insted of 2 5770s i would opt for a single 5850 which is far much better, and you end up saving $40

As far as the 5770 are concerned, it all depends on how much of a gamer you are. The only difference betweenthe two is that onw has 512mb while the other has1gb. For a heavy gamer you should opt for the 1gig one since the extra ram will help in higher resolution
April 1, 2010 11:36:57 AM

You definitely want 1gb if you are going to crossfire.
But yes, I would recommend the HD5850 instead.
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April 1, 2010 11:39:29 AM

The main performance difference between 512MB and 1GB versions is that the larger amount of memory help at higher resolutions or when you enable AA. That's the reason why the ATi Radeon HD 5870 Eyefinity 6 Edition has twice the amount of memory for its frame buffer to handle the 5760x2160 resolution.
My HD 4770 has 512MB GDDR5 RAM as well - the games I play aren't demanding, but I can max them out at 1080p, games like Call of Duty Modern Warfare 2, and F.E.A.R. 2: Project Origin. Personally, I'd go for the HD 5850, mainly because it can handle nearly every game max at 1080p - also if can afford it, later on you could get another HD 5850. HD 5850s in CrossFireX perform like an HD 5970.
April 2, 2010 12:47:08 AM

Starges said:
Insted of 2 5770s i would opt for a single 5850 which is far much better, and you end up saving $40

As far as the 5770 are concerned, it all depends on how much of a gamer you are. The only difference betweenthe two is that onw has 512mb while the other has1gb. For a heavy gamer you should opt for the 1gig one since the extra ram will help in higher resolution


Dude, What are you talking about?

2 5770 1gb are the same price, and much fasetr than the 5850, and sometimes pull ahead of the 5870.

EDIT: And a 5970 would beat 2 5850 becuase ven though they clock at the same speed, the 5850 has soem disabled cores.

The 5970 is like 2 downclocked 5870, all cores active.

The 5850 is like a slightly imperfect 5870 core that didn't make it, and has been downlocked a bit and the defective cores were disalbled.
April 2, 2010 1:47:48 AM

You are ignoring the insane overclocking ability of the HD5850 bob. Get it up over 1ghz and it will spank 2 HD5770s. The HD5770s ARE actually limited by the 128 bit bus when in crossfire, a problem the HD5850 does not have. Nor does it have any crossfire scaling/compatibility issues and it will also use less power. It's always best to start with a single card set up. Leave crossfire for an upgrade.
April 2, 2010 1:53:03 AM

Another vote for HD5850 single card is always easier to manage than dual cards.
April 2, 2010 4:37:10 PM

jyjjy said:
You are ignoring the insane overclocking ability of the HD5850 bob. Get it up over 1ghz and it will spank 2 HD5770s. The HD5770s ARE actually limited by the 128 bit bus when in crossfire, a problem the HD5850 does not have. Nor does it have any crossfire scaling/compatibility issues and it will also use less power. It's always best to start with a single card set up. Leave crossfire for an upgrade.


Right, but everything he said is still wrong.

The 5850 is NOT 40$ less than 2 5770s.

The 5850 IS NOT FASTER.

In fact, the 5770 CF is sometomes faster than the 5870.

And yes, the 5850 is the best option, but for none of the (incorrect) resons he stated.
April 2, 2010 9:17:11 PM

Well the OP did give prices and said the HD5770 1gb is 140 euros while the cheapest HD5850 is 240. So that is a 40 euros difference. True, they aren't dollars but that makes the difference actually more like $54.
April 2, 2010 9:39:17 PM

Whoa, Some serious price diffrences in Europe, back in the states the cheapest 5770CF is the same as the 5850, and the 5770 512mb CF is 40$ less.
April 2, 2010 10:16:46 PM

builderbobftw said:
Whoa, Some serious price diffrences in Europe, back in the states the cheapest 5770CF is the same as the 5850, and the 5770 512mb CF is 40$ less.

Were you unaware of the bum shafting that we get on this side of the pond?
April 2, 2010 10:28:36 PM

Lol- The pricing is a sad state of affairs for those across the ocean, and we've run into it far too many times on here.
Anyway- at the prices the OP has available, a single 5850 is clearly a better buy if you can save 40 Euro. If they were Identical price, I might suggest the 5770 Xfire, but it would still be a trade-off with performance vs. avoiding crossfire issues and a little less power and more upgradability.
April 2, 2010 10:35:08 PM

There is no performance trade off as long as you OC.
April 2, 2010 10:51:55 PM

You can OC those 5770's though jyjjy. They OC quite well too, and the Memory OC's like CRAZY, which helps to alleviate the 128bit Memory bandwidth bottleneck. Any way you push that one, there WILL be some performance tradeoff, especially if you don't want to OC, but most likely still there even when you DO OC them.
April 2, 2010 10:56:00 PM

You can OC the HD5770s but you can't bump up the voltage. If I remember properly the HD5770 usually gets 8-10% OC on the core. The HD5850 can do 40-50%
April 2, 2010 10:59:42 PM

Yep, It's the same thing with the people who said that that the 5830 beats the 4890 when you OC even though it grts ownd at stock.

They were forgettign some obvious things:

1. You can OC the 4890 to!

(In fact, the 4890 has massive headroom)

2. People think it can OC more than the 5850 becuase it's slower, but the 5830 runs at a high clock, and has LESS of an OC headroom than the 5850, the 5770, and the 4890.
April 8, 2010 8:53:07 AM

Thanks to all. I´m going 5850.
April 8, 2010 11:14:59 AM

jyjjy said:
You can OC the HD5770s but you can't bump up the voltage. If I remember properly the HD5770 usually gets 8-10% OC on the core. The HD5850 can do 40-50%



I thought you could overcome this by simply flashing the 5770? That way you are able to alter voltages on it, right?
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