Best mobo for Phenom 940 with 4850x2 gpu

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pij

pij

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Hello guys,

just wondered if ayone had any suggestions for the best mobo..

Will be buying the Phenom 940 and plan to use 4850x2 gpu... (crossfire)

Cheer for your help
 
pij

pij

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Asked the same question on another forum and it seems this one is good??...

Asus M3a79 T Deluxe 790fx...

Budget is 150 ish (uk pounds)...

Cheers
 
pij

pij

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will check that out, thanks for the info.

Just one more thing will the 4850x2 fit into the antec 900 or should I go with the 1200...

Thank you so much.

 
pij

pij

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Sorry not sure I was looking at then!!! was looking at the p2 945 and got mixed up for a second!!!
 
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trickymickey

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My understanding is that the phenom II 940 does not support ddr3 ram, so I'm not sure what happens if you go with ddr3, I would guess the system won't work. I'm not sure what the performance jump would be for going to ddr3 over ddr2 (looking at that for my system right now) but if you want ddr3 ram you need a am3 chipset. If you don't already have the processor and really want ddr3 I think either of these chips will work for you.

AMD Phenom II X4 810 2.6GHz 4 x 512KB L2 Cache 4MB L3 Cache Socket AM3 95W
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103650

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103674
 
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trickymickey

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My understanding is that the phenom II 940 does not support ddr3 ram, so I'm not sure what happens if you go with ddr3, I would guess the system won't work. I'm not sure what the performance jump would be for going to ddr3 over ddr2 (looking at that for my system right now) but if you want ddr3 ram you need a am3 chipset. If you don't already have the processor and really want ddr3 I think either of these chips will work for you.

AMD Phenom II X4 810 2.6GHz 4 x 512KB L2 Cache 4MB L3 Cache Socket AM3 95W
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103650

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103674
 
pat

pat

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the 940 lacks the ddr3 memory controller, while the 955 has both ddr3 and ddr2. When putting a 955 with both ddr2 and ddr3, the system with ddr3 was a bit faster, but in real life, you won't notice it. So, if you match the 940 you planned to get with a ddr3 board, you'll get a nice useless computer..
 
pij

pij

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Think I'll stick with the 940 ddr2 then....

Only thing left now is ... what is the best mobo??

Oh and can I run these 2 gpus with it... 4850x2 PLUS 4870x2.... or is that just being silly!!

 
Proximon

Proximon

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You need to figure out what you are doing and come up with a cohesive plan.

Either you are going to buy an X4 940 and a DDR2 board, or you are going to get an X4 945 or 955, at which point you can get either DDR2 or DDR3.

Why are you willing to spend so much on a motherboard for tiny performance gains but not getting a better processor for larger gains?
 
pij

pij

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Proximon.


As a newbie to all this I guess what I am (failing) trying to do is get some general feeling from the experts like you.

It will be my first build and I guess yes I may seem ill informed, stupid, haven't a clue ... or whatever you like .. but the bottom line is I am new to all this stuff.

I made a MISTAKE and misread the ddr3 thing and the 940 chip. (I now know that the 955 is ddr3 945 is ddr3 and the 940 ddr2) it was just a typo mate.

I know what build I am going to buy. As my post says.. I just wanted some heads up on the gpu and mobo.

As regards to spending a little more on the processor.. well I have looked at the i7 but I won't be doing much more than gaming and have added up the costs (inc x58 mobo) and its just too much.

If I go the 940 way I think I will be able to achieve better 'bang for buck' (as you guys say!!) for a decent gaming machine.

Cheers for everyones help so far.

PJ
 
Proximon

Proximon

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Good then, we have a good place to start.

If you intend to use crossfire 4850s, or a 4850X2, that suggests a certain budget.

Also, crossfire 4850s are good bang for the buck on a 22", 1680x1050 monitor but would not be as good a buy on larger monitors.

A 790FX board is something you buy to run two 4870s on, for a resolution of 1900X1200 or higher. Of course it's a deluxe board and may have a feature or two other than crossfire bandwidth, but mostly people buy AMD for just the reason you say... bang for the buck.

So, you get a 940 and pair it up with the equally economical 790X board and 4GB of 1066 DDR2.

Put as much money as is left over into GPU(s) and a PSU of high quality with enough amps to power the GPU(s), because THAT is where you get all the performance for gaming.

This is why we have the sticky at the top of the forum, so we avoid all this by knowing exactly what's needed up front ;)

 
pij

pij

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Thanks guys, thats really helpful.

So just to clarify I can run 2x4870's on the 790gx board...

hey just while I am on the subject of gpu's... I saw on Scan computers (Iam uk based no new egg for me!!) that I can pick up a 4870x2for 240 (pounds) which I thought was cheap.. but its the xfx one..

Another newbie question - (sorry) the 4850x2 runs at 1600 each (I think) and the xfx runs 4870x2 at 800.... I am missing something or is it just the reason they are so cheap as they are not the 'high spec' ones that Saphire and the rest produce...

As regards to the rest of my build, the reason I have not mentioned it as I had already done my homework (that makes a first eh ;-) and I already decided on..

Antec 900
Corsair 750w
and 4x2 ddr 2 1066 (BTW which brand would be the best - ram seems so cheap so I don't mind paying a little extra for a better brand)

Thank you so much guys.

PJ
 
pij

pij

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Also... I have just checked on scan computers/buyer and there are 4 ... could you provide the same link as new egg from one of these sites please!! Thank you
 
smithereen

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No, there is no way it runs each core at 1600mHz, I assume that's a misinterpretation by the web designer. (800mHz + 800mHz = 1600mHz?) XFX is one of the best ATi manufacturers. You can run 2 4870s on a 790X, 790GX, p45, any board that supports Crossfire and PCI-E 1.1 or 2.0.
 
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