hello .. i'm planning to buy 1090T & MSI 890FXA-GD70 MoBo, but i'm confused to choose the right RAM for my PC.

i'm looking to buy a dual channel 2x2GB DDR3-1600, maybe a Corsair Dominator series. I understand that a DDR3-1600 will automatically downgrade to 1333 level (but we can overclock it to its original speed). but if it possible if i install a second 2x2GB in the future. so i have a 4x2GB DDR3-1600 RAM? or for 4x2GB i have to choose DDR3-1333, not 1600?

i don't really understand about Phenom Memory Controller and its connection to a certain MoBo. AFAIK Phenom can handle max. DDR3-1333 but you can see in other brand MoBo (let's say ASUS M4A89TD Pro / Crosshair IV 890FX board), they listed 1600 as non OC supported memory.

any help would be appreciated ..

Welcome to the forum!

DDR3-1333 memory is native to AM3 boards.
1600 speed can be achieved via overclock or set in the bios, depending upon the particular board.
In other words, all AM3 boards have a bios setting for 1333, others allow for 1600MHz (and higher).
The 1090T should be able handle 8GB memory without any problems, better IMC than the Deneb lineup.
I suggest getting DDR3-1600 memory, if the board won't allow for a bios setting higher than 1333, at least you can overclock it.

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Phenom II X6 1100T B.E.@ 4.26GHz
Corsair H70 Core Hydro
ASUS Crosshair V Formula
2x4GB G.Skill RipjawsX@ 1894MHz, 9-10-9-28
SLI: 2x EVGA GTX 570's@ 902/1804/2032
Creative SB X-Fi Xtreme Gamer
Corsair HX850W Modular
Cooler Master HAF 922
2x Win 7 Home Premium (x64)

4 dimms populated is more stress on the imc getting 1600 with 4 dimms might not work 1333 is fine anything above is oc and the more sticks of memeory the more stress so 2x4gb would be less stress and 1600 or above more easy to achieve

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AMD Phenom II X6 1090T/CORSAIR H50
ASUS CROSSHAIR IV FORMULA
G.SKILL Flare 7-9-7-24 @2000mhz (4 x 2GB)
2-XFX 5850 1-285gtx PHYSX
Antec DF-85/AntecCP1000WATTS
WD X2 RAID 0 WITH WINDOWS 7 64/32

hello and thanks for your reply ..

sorry kleetus, but it can be more helped if you give me a punctuation for your post. I'm from Indonesia and i think my English is not so quiet good
i wonder if this is what your meant :
"4 dimms populated is more stress on the imc. getting 1600 with 4 dimms might not work, 1333 is fine. anything above is oc and the more sticks of memeory the more stress. so 2x4gb would be less stress and 1600 or above more easy to achieve."

2x4gb would be awesome. but i think my budget is running low. i've looked for single channel 4gb AMD tested RAM in my town but can't find any of them.

can you give me a recommendation for what RAM should i buy? at least this is the list of AMD memory that available in my town
Gskill F3-10666CL9D04GBNQ-> supports AMD 890 Series Chipset
Gskill F3-12800CL9D-4GBNQ -> supports AMD 890 Series Chipset & listed MSI 890FXA-GD70 as Qualified Motherboards List
Gksill F3-12800CL9D-4GBRL (Ripjaws) -> supports AMD 890 Series Chipset & listed MSI 890FXA-GD70 as Qualified Motherboards List
OCZ DDR3 PC3-10666 Platinum AMD
Corsair Dominator CMP4GX3M2B1600C8

honestly i'm interested by Dominator heatspreader model, but you can suggest other memory if that that fits better in my MoBo and in the future, i can add another 2x2gb without any stability issues or such things.

The CL 8 because it has the lowest timing...

-------------------------
Lad

I have had this name before the public announcement of L4D.

Out of those I have to definately say the Corsairs.

However, there are some CL7 1600MHz Corsair Dominators that would be even better. I know because I have them myself.

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Main Rig:
Cooler Master HAF 932 Full Tower : Corsair 750HX Modular PSU : Asus Crosshair III Formula : Phenom II X4 965 125W
Corsair H-50 CPU Cooler : Corsair Dominator GT DDR3 1600 7-7-7-20-1T 2x2GB : WD Caviar Black 32MB 640GB : Sapphire HD5870 Vapor-X
HTPC:
Antec Fusion Remote Black : ASUS M4A785TD-M EVO : Athlon II X2 240e : Crucial BallistiX 1600 2GB x2
Corsair 400W : Sapphire Radeon HD6850 : Lite-On iHBS112 BD-Burner : WD Caviar Green 500 GB

my bad. yes that was perfect understanding
why do you need 8gb. i would go with 4gb at better speed and timings, but i dont need 8gb. yuo maybe doing stuff that requires 8gb though

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AMD Phenom II X6 1090T/CORSAIR H50
ASUS CROSSHAIR IV FORMULA
G.SKILL Flare 7-9-7-24 @2000mhz (4 x 2GB)
2-XFX 5850 1-285gtx PHYSX
Antec DF-85/AntecCP1000WATTS
WD X2 RAID 0 WITH WINDOWS 7 64/32

Hi Rangga90, Just wanted to share my setup. I have 4x2GB RAM running just fine. In fact stock memory is 1600 with DDR3 memory profiles but I've OC'd them to 1726 with 0 stability issues. Below is the specs...

890FXA-GD70 MoBo
AMD Phenom II X6 1090T running at 4.014 GHz on Air
8GB (4x 2GB) G.SKILL Ripjaw DDR3 @ 1726 MHz (F3-12800CL9Q-8GBRL)
2x XFX Radeon HD 5870 Crossfire OC @ 900MHz/1300 MHz
3x Corsair F120 SSD - RAID 0 (754 MBs R/W)

BTW... The memory is available on NewEgg.com for $134.99 USD