DDR-800 in 1066 slots??

I'm not sure about the first part (it should work, but I'm not positive).

However, for the second question, 2GB of 800MHz RAM would be better than 1GB of 1066MHz RAM. 1066MHz is obviously better than 800MHz, but capacity is much more important than speed.
 
What motherboard do you have? Generally motherboards can take both 800 and 1066 as standard Ram, at least that's what mine does.
 
yes they will work. But they will run at 800mhz(unless u overclock them). and 2gb 800 are better than 1gb 1066
 
cool thanks....i was trying to decide between:

Asus M3A AMD 770, 4x DDR-II 1066, 1 PCIe 2.0 x16, 1PCIe x1, 3x PCI, 1 IDE, 4x SATA w/RAID, GB LAN, 10x USB, 8ch Audio

or

Asus M2N-E Socket AM2 nForce 570 Ultra MCP Chipset DDR2 533/667/800 6xSATA PCI-Express x16 Slot 7.1 Channel Audio Gigabit Lan AMD Live! Ready

Think I'll go with the M3A since they are almost the same price and it's AM2+
 
The only time you can run DDR2 1066 on the 770 chipset board is if you running a Phenom, it will work if you run a Athlon 64 on a 770 but will back clock to 800. My advice is not to buy a AM2 board at this point, waste of money. Get a AM2+, has alot better Phenom support-DDR2 1066 support-Hypertransport 3.0 and PCIe 2.0. That Asus board is alright but this Gigabyte is better if you looking for a 100 buck board
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128081
 
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I,m sure the Asus would be a good board but the Gigabyte has better voltage regulators and all solid capacitors.
 
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