BIOS only shows the ram 'speed 1600 but mine is 1866 ??

KTTB

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Aug 2, 2013
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PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD A10-5800K 3.8GHz Quad-Core Processor ($109.99 @ Amazon)
Motherboard: MSI FM2-A75MA-E35 Micro ATX FM2 Motherboard ($56.00 @ Amazon)
Memory: G.Skill Ripjaws X Series 4GB (2 x 2GB) DDR3-1866 Memory ($43.99 @ Newegg)
Storage: Western Digital Caviar Blue 250GB 3.5" 7200RPM Internal Hard Drive ($54.89 @ Outlet PC)
Case: NZXT Source 210 (White) ATX Mid Tower Case ($44.98 @ Newegg)
Power Supply: Corsair Builder 430W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($17.98 @ Outlet PC)
Total: $367.82
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-13 17:45 EDT-0400)

so i just built it , as you can see i have g skill 1866 but when i booted into the BIOS it says 1600 ???
 
Solution
^+1 you should be able to set the speed of the RAM in the BIOS. The motherboard may be defaulting to 1600mhz but you should have no problem changing that.