Which is better for 3 displays, the 5870 or the 7950?

I have a Radeon 5770 in a 2010 3.33 6 core. I have a 30" Samsung 305T running at 2560x1600 (DL DVI) and a 1080p HDMI monitor running off a MDP->HDMI adaptor. Even this seems tenuous as occasionally one or both monitors need some cajoling to fire up. Some research on this is giving me the idea that this could be either a power draw issue or a VRAM issue on the 5770, and while it may have 3 ports, in practical terms it's probably hard to get them all to work because of the card's other limitations. I know some people have better results using powered adaptors.
I also have been using a DisplayLink USB adaptor to get a 3rd monitor (17" DVI) going but this requires a considerable amount of the Mac CPU.
I'm looking into either a 5870 or a 7950 upgrade to make the monitor situation I do have more reliable, less drain on the CPU, and to be able to hook my 3rd (or possibly even 4th) monitor without resorting to DisplayLink.
I RARELY do gaming, so high frame rates are not my criteria. I'm an audio professional and run Logic Pro on all my screens. What I want is reliability, a quiet fan, and no-hassles with multiple monitors at high resolutions.
Any suggestions as to which card is best for my purposes? Thanks.

You do not need a new graphics card, you need to understand what AMD is doing with Mini DisplayPort.
The levels on Mini Displayport are much lower than older protocols. Mini DisplayPort can be requested to produce backward compatible protocols, but there is not enough POWER to run two at the required levels. It needs ACTIVE adapters (with signal boosters) to convert more than one. Third party Mini Displayport to Single-Link DVI costs about US$35.
What are the basic requirements for connecting multiple displays?
Connecting multiple monitors for AMD Eyefinity technology couldn’t be simpler. There are four easy rules to remember:
The first two monitors can connect to the graphics card with any display output on your product: HDMI, VGA, DVI or DisplayPort.
The third (or greater) display must be connected to the graphics card via DisplayPort.
If your monitor does not have a DisplayPort connection, you will need an inexpensive active DisplayPort adapter for it. DVI to DP adapters can be had for less than $30 USD.2
Every family of GPUs supports a different maximum number of displays.

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