It's hard to say what should be what without more system spec info. You have your FSB to RAM ratio set to 3:4, so if anything, if you have your FSB speed set correctly at a 3:4 ratio your RAM should be overclocked not underclocked. For instance my ratio is set to 4:5. My FSB is set to 375. 375 divided by 4 = 93.75 multiplied by 5 = 468MHz DDR2 you double that and it gives the RAM speed of 936 for my DDR2 800. An overclock of 136MHz on my memory. If I knew your FSB speed on your CPU I could tell you. As a guess I think maybe your processor is underclocked as well as your RAM. maybe... And yes if set to stock you should be getting 333MHz doubled to 666, what your RAMS speed is.
EDIT: I looked at your specs in your profile. You have your FSB set right for an E4300 200MHz. At a 3:4 ratio your RAM speed is right. If you want the RAM to run at it's stated speed then you either have to overclock the CPU or use a different RATIO, and or change the strap. What's happening basically is your RAM is faster than you need. Stock for that CPU would be DDR2 400. What you can do though, since you are running your RAM underclocked is to set the timings a lot tighter. If it's cas3 or something like 3-3-3-12 you can probably run it at cas2 2-2-2-10 or 2-3-3-10. The faster timing will give you a slight performance boost. What mobo do you have? I'll tell you what. Go back in your BIOS and see if you can set the ratio to 2:3. You may have to change the N/B Strap CPU setting. At a 2:3 ratio that will get your RAM speed up to 300MHz instead of 267. Personally, if it was me, I'd just overclock that bad boy. Raise the FSB to 266. That will push your CPU speed to 2.4GHz which is a modest overclock for that CPU. Then with the 2:3 ratio the RAM would be running right where it should be. Then you would see a serious performance jump. The VCore and DIMM voltage would need to be raised a little bit maybe, but not to anywhere that the stock cooler couldn't handle it. But that's me. You need to do what you are comfortable with. I'm a bit of an OC whacko! <g>