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Best mobo for Phenom 940 with 4850x2 gpu

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June 21, 2009 4:28:23 AM

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
June 21, 2009 5:02:26 AM

wait for the HD-5000 series in Q3.
Related resources
June 21, 2009 5:39:34 AM

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
a c 113 B Homebuilt system
June 21, 2009 7:09:48 AM

Sure, although it's overkill for two 4850s.

How about you save 40 pounds and get this Asus,
http://www.ebuyer.com/product/160931
then spend the money somewhere else, like a good after market CPU cooler? You'll never notice the difference in the boards with two 4850s.
June 21, 2009 9:28:35 AM

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.

June 21, 2009 2:37:21 PM

pat said:
The 940 DOESN'T support DDR3..



Sorry not sure I was looking at then!!! was looking at the p2 945 and got mixed up for a second!!!
June 21, 2009 3:30:13 PM

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=N82E168...

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=N82E168...
June 21, 2009 3:31:17 PM

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=N82E168...

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=N82E168...
June 21, 2009 3:56:49 PM

pij said:
How about these 2..

http://www.overclockers.co.uk/showproduct.php?prodid=MB...

http://www.ebuyer.com/product/158607

The 2nd on is a ddr3 board. If I did opt for the ddr3 board with better memory would I see a difference in games at all? or would it be that small that it would not justify the costs??

Bearing in mind the specs above (4850x2) i.e let the gpu's do the talking not the cpu....


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..
June 21, 2009 4:04:09 PM

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!!

a c 113 B Homebuilt system
June 21, 2009 6:11:25 PM

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?
June 21, 2009 11:51:36 PM

Gigabyte 790X is nice. So are ASUS 790GXs and 790FXx.
June 22, 2009 12:20:50 AM

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
a c 113 B Homebuilt system
June 22, 2009 2:11:45 AM

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 ;) 

June 22, 2009 5:43:04 AM

Thats what I said. It's a sweet deal, 790GX without the highpowered onboard graphics.
June 22, 2009 9:19:23 AM

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
June 22, 2009 10:09:33 AM

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
June 22, 2009 3:11:13 PM

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.
June 22, 2009 7:27:43 PM

on the gfx, look at the asus 4870 X2 on OCUK, £240 and it has a far superior cooling system, and therefore overclocks better.
June 23, 2009 1:19:59 AM

great stuff guys - think I have my build

P2 940 BE
4870x2 Asus
Gigabyte mobo 790x ddr2
Antec 902
4gb Corsair
(Aftermarket heatsink - tbd)
Corsair 750w
WD 640gb HD
Vista 64 bit
Asus V226h (22inch) Widescreen 1920x1080
LG optical drive

Comes in at (Uk pounds) = 1126

Thoughts??...
June 23, 2009 4:30:09 AM

Just one other thing guys (can't you tell I am on holiday and have waaay too much time on my hands!)

I was just reading the feedback on new egg fop the mobo mentioned above and it looks awesome for the price however 1 comment makes me feel a little uneasy...

''Everything about his board is awesome except the PCI-E graphics slots. That is such a bummer because if they had done that right this board would be legendary. Honestly, that holds it back so bad it's just sad. My 780i with a 3.0 ghz quad and the same video card, PSU and RAM runs games better than this board does. And it's 600mhz slower on all 4 cores and supposedly 800mhz slower on the FSB, I don't trust AMDs bus speeds. The FSB reference clock is at 240mhz at 2400mhz and the Intel board is 400mhz at 1600mhz. What's the deal with that? That's why this board gets only 3 eggs. If you're not gaming it will rule, if you are, buy a board that hits the true bandwidth of the PCI-E 2.0 which is 5000mhz. I am running a HD4850x2 with dual GPUs, maybe if you're running a single GPU card it won't make such a big difference. Says right in the BIOS: "Not guaranteed to operate properly past 100mhz" and it won't go past 107 on mine. Sad.''


Does anyone know if this is true or maybe he just had a bad board???

Cheers PJ
a c 113 B Homebuilt system
June 23, 2009 5:06:41 AM

I have no idea what this person is trying to say. They are comparing this board to an Intel board, but they make no mention of what CPU they are using. This person would appear to be clueless and seems to think AMD and Intel should have identical architecture.

That was written by someone hoping to sound smart and failing.
June 23, 2009 5:16:13 AM

Right... don't listen to the idiot. The board's fine.
June 23, 2009 5:31:53 AM

yeah I have just done some more research about this and apparently you have to plug your gpu into a particular pci slot to get full bandwith.

I am going to get this board for sure. Just to be sure (remember I am still learning ;-)...

that the 4870x2 will only take 1 slot ..(i.e I don't need to use crossfire) as it seems at crossfire the board only supports 1 x16 or 2 x8 (halves the bandwith)...

Cheers again guys.

Oh and I just managed to knock 50 quid off my build as I had the wrong version of vista priced in!!! doh. :-)

PJ
!