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Super Conundrum!

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March 18, 2012 6:07:08 PM

I am purchasing the AMD FX-8120 3.1 GHz 8-core processor and the ASUS Crosshair V Formula AM3+ AMD 990FX (links are below)

Processor: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Now here is the conundrum that I am not understanding...
My motherboard supports RAM all the way up to 2133 O.C.
My processor has this little snippit in the features dialogue saying this:
The AMD FX Processor features a high-bandwidth, low-latency integrated memory controller that supports up to DDR3-1866 and new low voltage memories of 1.35V and 1.2V and provides new Pre-Fetcher improvements and direct communications to each core in Dual-Core module (APIC registers in each core).

Soooo what RAM should I get? Better yet! Can anyone make sense of this for me so I am not just HANDED the answer and can understand it.

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a b } Memory
a b À AMD
March 18, 2012 6:17:04 PM

Buy RAM at 1600Mhz , for a normal user is more than enough.
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March 18, 2012 6:27:35 PM

sosofm said:
Buy RAM at 1600Mhz , for a normal user is more than enough.



I don't feel like a "normal" user, and this is why I am not buying a pre-built box. I will be doing a lot of graphic intensive things and very large scale vector illustrations along with some Cinema 4D renders that will generally have plenty of caustics and reflections in them. I will be doing a fair share of gaming too and I want to play Skyrim as well LOL. I mostly play Tribes Ascend at the moment though. GOTTA GO FAST!

The build will include:
AMD FX-8120 3.1 Zambezi
ASUS Crosshair V Formula AM3+ AMD 990FX
2x EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi) 1GB 256-bit GDDR5
SSD 60GB
Some Seasonic PSU once the remainder is decided.

All in a Coolermaster HAF X 942 full tower.

Maybe that will change your mind about the 1600MHz? I appreciate the advice!
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a c 347 } Memory
March 18, 2012 7:00:23 PM

By default the AMD FX CPU supports up to DDR3-1866, that is as long as there's not only an XMP-1866 which is an Intel-only 'SPD' encoded into the RAM, but if the RAM also has a JEDEC 'SPD' of 933MHz then it should defult to DDR3-1866 with corresponding CAS/voltage. The CPU can support both lower RAM Frequencies and higher RAM frequencies. Further, the DRAM Voltage (aka RAM voltage) now can support both 1.35v and 1.20v DIMM.

In the past and still to some degree now the less efficient (higher nm lithography) RAM required high voltage faster (1.60v~1.65v) than DDR3-1333 1.50v typical voltage.

To confuse you even more, maybe, the ASUS Crosshair V Formula specs:
"4 x DIMM, Max. 32GB, DDR3 2133(O.C.)/2000(O.C.)/1800(O.C.)/1600/1333/1066 Hz ECC, Non-ECC, Un-buffered Memory"

Since the MOBO also supports AM3 CPUs the specs are geared for the AM3 CPU.
---

What RAM to get, I recommend 16GB kits DDR3-1866 - http://www.newegg.com/Product/Productcompare.aspx?Submi... keep in mind you may need to set the RAM Frequency, CAS Timings, and Voltage manually for optimal operation.

Soon AMD will offer 'AMD Radeon Edition' kits which are plug-n-play DDR3-1866, but they're not available yet.

Currently the 'AMD Performance Edition' is available in 2x4GB CAS 8 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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March 19, 2012 1:25:44 AM

jaquith said:
By default the AMD FX CPU supports up to DDR3-1866, that is as long as there's not only an XMP-1866 which is an Intel-only 'SPD' encoded into the RAM, but if the RAM also has a JEDEC 'SPD' of 933MHz then it should defult to DDR3-1866 with corresponding CAS/voltage. The CPU can support both lower RAM Frequencies and higher RAM frequencies. Further, the DRAM Voltage (aka RAM voltage) now can support both 1.35v and 1.20v DIMM.

In the past and still to some degree now the less efficient (higher nm lithography) RAM required high voltage faster (1.60v~1.65v) than DDR3-1333 1.50v typical voltage.

To confuse you even more, maybe, the ASUS Crosshair V Formula specs:
"4 x DIMM, Max. 32GB, DDR3 2133(O.C.)/2000(O.C.)/1800(O.C.)/1600/1333/1066 Hz ECC, Non-ECC, Un-buffered Memory"

Since the MOBO also supports AM3 CPUs the specs are geared for the AM3 CPU.
---

What RAM to get, I recommend 16GB kits DDR3-1866 - http://www.newegg.com/Product/Productcompare.aspx?Submi... keep in mind you may need to set the RAM Frequency, CAS Timings, and Voltage manually for optimal operation.

Soon AMD will offer 'AMD Radeon Edition' kits which are plug-n-play DDR3-1866, but they're not available yet.

Currently the 'AMD Performance Edition' is available in 2x4GB CAS 8 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...


YOU!... YOU!!! This is an absolutely wonderful find! Those 2x4GB performance editions are PERFECT! Thanks for the explanation too. I had always tweaked those settings in previous builds because something felt "off" and never REALLY understood what I was doing really. Too many tuts telling you to "DO" instead of "WHY YOU SHOULD DO". Thanks again! My wife will absolutely LOVE the AMD memory.
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March 19, 2012 1:25:53 AM

Best answer selected by dauntlessds.
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a c 146 } Memory
March 19, 2012 2:15:16 AM

This topic has been closed by Nikorr
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