RAM compatibility with AMD fx-8350

[Volanden]

In my mobo user Manuel it says some cpu's may not allow 1600Mhz or higher and was wanting to purchase Corsair Vengeance Pro 16GB 2x8GB DDR3 2400MHz RAM or is 2400Mhz to much for this CPU?

 

[Darkbreeze]

2400Mhz RAM is likely to be problematic with FX chips, especially with more than one module. I'd stick to 1866mhz 1.5v modules. Even the AMD website finally eludes to the fact that 1866mhz is the highest officially supported memory speed for FX chips. They didn't used to until it became clear that higher frequencies, especially using more than two modules, was a serious problem.

http://support.amd.com/en-us/kb-articles/Pages/ddr3memoryfrequencyguide.aspx

 

[Volanden]

2400Mhz RAM is likely to be problematic with FX chips, especially with more than one module. I'd stick to 1866mhz 1.5v modules. Even the AMD website finally eludes to the fact that 1866mhz is the highest officially supported memory speed for FX chips. They didn't used to until it became clear that higher frequencies, especially using more than two modules, was a serious problem.

http://support.amd.com/en-us/kb-articles/Pages/ddr3memoryfrequencyguide.aspx

thanks a lot man now since my mobo has 4 slots http://www.amazon.com/gp/product/B008B6ONXK/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 should i take advantage of all 4 with http://www.amazon.com/Corsair-Vengeance-PC3-12800-1600mHz-CMZ8GX3M2A1600C9B/dp/B004QBUL1C/ref=sr_1_fkmr2_1?s=electronics&ie=UTF8&qid=1429937798&sr=1-1-fkmr2&keywords=Corsair+Vengeance+Blue+16+GB+%282x8+GB%29+DDR3+1600MHz+%28PC3+12800%29+Desktop+Memory+CMZ16GX3M2A1600C10B or just 2 with http://www.amazon.com/Corsair-Vengeance-1600MHz-Desktop-CMZ16GX3M2A1600C10B/dp/B009M0TCK8/ref=sr_1_1?s=electronics&ie=UTF8&qid=1429937798&sr=1-1&keywords=Corsair+Vengeance+Blue+16+GB+%282x8+GB%29+DDR3+1600MHz+%28PC3+12800%29+Desktop+Memory+CMZ16GX3M2A1600C10B or http://www.amazon.com/Corsair-Vengeance-Desktop-Memory-CMY16GX3M2A1600C9B/dp/B00D2LGRLK/ref=sr_1_fkmr0_2?s=electronics&ie=UTF8&qid=1429937457&sr=1-2-fkmr0&keywords=Corsair+Vengeance+Blue+16+GB+%282x8+GB%29+DDR3+1600MHz+%28PC3+12800%29+Desktop+Memory+CMZ16GX3M2A1600C10B

these will be my other components
http://www.amazon.com/gp/product/B00OAJ5N6I/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B009O7YUF6/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B009O7YUF6/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B00EB7UIRS/ref=ox_sc_act_title_6?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B004SUO068/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B00BSKY1M4/ref=od_aui_detailpages00?ie=UTF8&psc=1
and
http://www.amazon.com/gp/product/B00H09BB16/ref=od_aui_detailpages00?ie=UTF8&psc=1
with the mobo above.

 

[Darkbreeze]

This would be a good option. Those others are only 1600mhz:

PCPartPicker part list / Price breakdown by merchant

Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1866 Memory ($59.99 @ Newegg)
Total: $59.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-25 01:17 EDT-0400

 

[Volanden]

This would be a good option. Those others are only 1600mhz:

PCPartPicker part list / Price breakdown by merchant

Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1866 Memory ($59.99 @ Newegg)
Total: $59.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-25 01:17 EDT-0400

would it be ok if i used all four slots with these sticks or should i just use two? trying to figure out which config would perform better.

 

[Darkbreeze]

Fewer modules is always better. Regardless of what each modules size is, each module uses a specific voltage. The more modules there are, the more strain on the memory controller. Two modules uses less voltage than four modules, therefore less stress and better stability. You still want to maintain dual channel operation though, which is why it's recommended to buy in pairs. The only time you want to use more memory banks is when you need more memory but the slots that are populated already have the largest possible module capacity installed.

If you want 4GB, use 2 x2GB, for 8 use 2 x4GB, for 16 use 2 x8GB, etc.

If the board only supports 4GB modules in each slot, but you want 16GB, that's when you would use four modules. If each slot supported 8GB modules, you would want to use only two slots to make your 16GB.