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Which is the best motherboard for AMD Phenom II X3 720?..

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March 31, 2009 8:54:05 AM

I read a article http://www.anandtech.com/mb/showdoc.aspx?i=3533 and I have decided to build a new PC with Phenom II X3 720. I am going to use two HD 4850 512MB in crossfire. Can you guys please recommend some good mobos with Crossfire support for X3 720 within $150.

But, I am unable to distinguish between mobos which say its AM3 support and some say its AM2/AM2+ support.

In AMD's website I noticed that the socket type for X3 720 is AM3. And I looked for the recommended motherboards for X3 720 in AMD's site. I searched for 790GX chipset and there it showed AM2+ as the socket type for one of the recommended motherboards for X3 720.

I am really confused :(  . Which one should I use?..Which is the latest socket type here. Will CPUs be supporting AM3 or AM2+ in future.

Can u guys please help me..

Thank u..
March 31, 2009 9:18:04 AM

I've just bought a Phenom II 720BE computer and was confused about this also.
All the Phenom II CPU's are AM3 (except one or two I think which are AM2+ only) but have DDR2 and DDR3 memory controllers so you can use any Phenom II with an AM3 motherboard or AM2/AM2+ motherboard. Any of the boards with 780 chipset or higher will work (may need a BIOS update first).
The board I went for is an AM2+ Gigabyte with a 780 chipset (although it can't do crossfire so no good for you)
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March 31, 2009 11:57:33 AM

Does these motherboards support DDR3 RAM? In the websites of both ASUS and Gigabyte, it shows only DDR2 in the Qualified Vendor List for Memory..
March 31, 2009 12:11:45 PM

hi gkay09,

when I used AMD's search tool to find the recommended motherboards for X3 720, it showed me only GA-MA790GP-DS4H for Gigabyte (790GX chipset). The model which you suggested above GA-MA790GP-UD4H for Gigabyte (790GX chipset).

Can I still use GA-MA790GP-UD4H?...
March 31, 2009 12:25:21 PM

Yes that motherboard will work.
All the AM3 socket boards support DDR3, I'm not certain on the AM2/AM2+ but I think most only support DDR2
March 31, 2009 3:00:14 PM

Is there really any advantage by choosing a mobo that will support DDR3?..Or shall I go with AM2/Am2+ mobo?..

I mean, will DDR2 RAM be effective for another 3-4 years.. Or would there be a necessity for me to move to DDR3 in future?..
April 2, 2009 2:32:23 AM

The DDR3 option is only popular at the moment because of the extremely low prices. It has always been my mantra to buy the fastest I can afford to last me longer. As 64 bit OS's and apps become more predominant, DDR3 users will see more benefits at that point, with their obvious speed capabilities over DDR2.
a b V Motherboard
April 2, 2009 4:45:50 AM

taruncharles said:
Is there really any advantage by choosing a mobo that will support DDR3?..Or shall I go with AM2/Am2+ mobo?..

I mean, will DDR2 RAM be effective for another 3-4 years.. Or would there be a necessity for me to move to DDR3 in future?..


Well currently no applications have shown much advantage using a DDR3 over a DDR2 RAM...
But 3-4 years is a long time and am sure you will get another RAM standard by then...
My suggestion would be to go with DDR2...even after 3-4 years, if you want to increase your RAM, you will get the DDR2 then as you get DDR and SDRAM even now...

But if you really want to get DDR3(though not required), get the cheapest DDR3 1333 you get...
Get this mobo and RAM if you want to go with DDR3.
Mobo
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
RAM
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
a b V Motherboard
a b À AMD
April 2, 2009 5:02:19 AM

AM3 cpu's fit in either AM3 mother boards or AM2+ motherboards .

AM3 boards use DDR3

AM2 boards use DDR2


Theres not much of a gaming performance boost with DDR3 so when it was expensive it wasnt worth it . Right now I'd say if you can afford a DDR3 board and RAM you might as well buy one .

If AM3 isnt in your budget , then you lose pretty much nothing except maybe upgradability in 2 -3 years time

THis would be my pick for an AM3 motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
April 2, 2009 11:49:26 AM

Really thanks a lot for all your help guys..

Finally I have decided to go with a AM3 mobo and DDR2 RAM.
Here is what I have decided to buy. I havent decided on the PSU, Case and Hard disk..

CPU - Phenom II X3 720BE
Motherboard - ASUS M4A78T-E AM3
RAM - G-Skill F2-8800CL5D-4GBPI 4GB. Latency - 5-5-5-15
GPU - Two HD 4850 512MB in crossfire
OS - Windows Vista Home Premium 32bit

Are there any modifications I need to do..Should I buy a RAM with a different timing?..
Is it good if I choose AM3 mobo and DDR2 RAM with 32bit Vista?..
Also I was trying to calculate the power supply I would need. I couldnt find X3 720 CPU listed any PSU calculators. Not even in in http://extreme.outervision.com

Any suggestions on the PSU guys..Are there any decent PSU calculators that has X3 720 listed..

Thank u..
a b V Motherboard
April 2, 2009 11:52:45 AM

Well 2 4850 in crossfire ??? Do you have those or have to buy them???
April 2, 2009 11:55:19 AM

I have one 4850..And I have to buy the other..
a b V Motherboard
April 2, 2009 12:04:09 PM

ohh...ok...and the RAM is it DDR2 or DDR3 because the mobo supports only DDR3 and the RAM is DDR2...

DDR2 and DDR3 are different standards...So a DDR2 wont fit a DDR3 slot and vice versa...
a b V Motherboard
April 2, 2009 12:07:45 PM

Well I just read the above post...If you want to go with DDR3 mobo, you should get DDR3 RAM and it wont support DDR2...
So get this DDR3 RAM which I had suggested...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Or change your mobo, which supports DDR2...

And for you config, I would suggest atleast a good quality 600W PSU...
April 2, 2009 12:15:19 PM

oh..I thought that mobo would support both..
I have decided to move to DDR2 itself. So i ll get ASUS M4A78-E AM2+/AM3
April 2, 2009 12:55:05 PM

ok...since most of u suggested DDR2, i ll settle with DDR2 itself now..
And I ll use windows vista 32 bit..
I will upgrade to windows 7 in future..I hope Microsoft releases a 32bit version of windows 7..

Anyway for now, I ll use DDR2..
Is there any chance there is a mobo out there that supports both DDR2 and DDR3..I guess I might be greedy here..but just wanted to confirm whether I could upgrade to DDR3 and 64-bit windows in the same mobo..

Thank u..
a b V Motherboard
April 2, 2009 1:08:57 PM

:p  DDR2 and DDR3 on the same mobo
Well actually there is but don't know about its availability
MSI 790GX-8D
This is the only AM mobo to support both DDR2 and DDR3....

And you do you want to stick with 32bit...???
I doubt that Win 7 will come in 64bit flavour...And using a 32 bit OS, you will only be getting 3.5GB of the 4GB RAM...
April 2, 2009 5:22:07 PM

gkay09 said:
:p  DDR2 and DDR3 on the same mobo
Well actually there is but don't know about its availability
MSI 790GX-8D
This is the only AM mobo to support both DDR2 and DDR3....

And you do you want to stick with 32bit...???
I doubt that Win 7 will come in 64bit flavour...And using a 32 bit OS, you will only be getting 3.5GB of the 4GB RAM...


DDR2 is simple and cheap...so i ll use that itself...and as for the mobo i ll use Gigabyte GA-MA790GP-UD4H.

Do I need a CPU cooler here?..And if I go for two 4850 512MBs, do I need a GPU cooler too?..

Thank u...
April 3, 2009 1:52:27 AM

I'm in this boat too. I've decided to buy a 720 core system with a 4890. For the motherboard, I'd like to be able to overclock, have the ACC option for gambling for my 4th core, and potential for Crossfire later on.

From my understanding, most of these boards have 2 PCI-E slots, but when you go Crossfire, they perform 8x instead of 16x. Is that a decent performance hit compared to 2 x16 PCI-E slots?

Are there any boards that offer everything I said above as well as 2 PCI-E slots that will crossfire in x16 each?
a b V Motherboard
April 3, 2009 4:03:09 AM

Boge42 said:
I'm in this boat too. I've decided to buy a 720 core system with a 4890. For the motherboard, I'd like to be able to overclock, have the ACC option for gambling for my 4th core, and potential for Crossfire later on.

From my understanding, most of these boards have 2 PCI-E slots, but when you go Crossfire, they perform 8x instead of 16x. Is that a decent performance hit compared to 2 x16 PCI-E slots?

Are there any boards that offer everything I said above as well as 2 PCI-E slots that will crossfire in x16 each?

Hi...it would be nice if you would start your own thread so that you can get better suggestion w.r.t you particular situation...

And as for you question, there is no significant performance difference when the the 2 graphics card perform in x8x8 mode...

And for about $190 odd, there is a mobo which offers x16x16 lanes slots....
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

But am sure you wont notice the difference in performance...
a b V Motherboard
April 3, 2009 4:06:55 AM

taruncharles said:
DDR2 is simple and cheap...so i ll use that itself...and as for the mobo i ll use Gigabyte GA-MA790GP-UD4H.

Do I need a CPU cooler here?..And if I go for two 4850 512MBs, do I need a GPU cooler too?..

Thank u...


Get a CPU cooler if you want to overclock your CPU...But actually having an aftermarket cooler, considerably lowers the temps of your CPU, thus works stable...

No its not necessary to get a GPU cooler...
April 8, 2009 5:40:08 PM

gkay09 said:
Hi...it would be nice if you would start your own thread so that you can get better suggestion w.r.t you particular situation...

And as for you question, there is no significant performance difference when the the 2 graphics card perform in x8x8 mode...

And for about $190 odd, there is a mobo which offers x16x16 lanes slots....
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

But am sure you wont notice the difference in performance...


Oh my God...I didn't notice this till now..
Out of my own stupidity I bought this video card already - http://www.canadacomputers.com/index.php?do=ShowProduct...

Do I need a mobo with 2 x16 PCI-E slots to run another card in crossfire?..Cant I use the following board for crossfire with this card?..
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

And should the second card also be from the same manufacturer with PCI Express 2.0 x16 interface?..

Thank u..
a b V Motherboard
April 9, 2009 3:47:58 AM

taruncharles said:
Oh my God...I didn't notice this till now..
Out of my own stupidity I bought this video card already - http://www.canadacomputers.com/index.php?do=ShowProduct...

Do I need a mobo with 2 x16 PCI-E slots to run another card in crossfire?..Cant I use the following board for crossfire with this card?..
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

And should the second card also be from the same manufacturer with PCI Express 2.0 x16 interface?..

Thank u..


You can choose any of those mobos you want...The board should have 2 pcie slots and should support xfire thats all...
The second card neednt be from the same manufacturer...
!