3 R.A.M. questions + 1 Hard Drive question

First question is when I play the game Battlefield 3, I get around a jumpy 18-24 FPS, graphics card is GT 610 2 GB VRAM by Palit, I tested this on another computer from a friend, it has an i5 (what I can remember and don't know the clock speed and number of cores), Windows 7 64-bit (don't know the version but is has the Aero scheme), 4 GB of RAM and a GT 430, I said to my self, how can a 430 is better than a 610? I can play BF3 with auto settings at 1366x768 if I can remember and it doesn't lag, even in extensive scenes. Maybe because it's bottle neck? RAM or CPU?

Second question which may help the above one, I bought a new RAM from Kingston, it's a 2GB DDR3-10600 CL9 240-Pin DIMM, it fits in the slots of my PC, I can here it tabs clicking which means it's locked, but when I turn the PC on, it gives me a long and a short beep, I did a CMOS reset but beeping still continues, I removed the new one and left the stock one, it works, I removed the stock one and placed the new one, it gives me those beeping sounds, whatever I do try to fit it in, it doesn't work. I returned to my stock one and it's fine, any reason why?

Third question, the sticker on my RAM stick tells me that it's a DDR-3 PC3-10600, when I go to the BIOS, it tells me that it's a PC3-8500, CPU-Z tells me it's a PC3-10700, I don't know what to trust, the sticker, BIOS or CPU-Z?

Fourth question, can I combine my stock one and the new one if it fits? According to a PC repair shop, it says, it's compatible, I just wanted to be sure

Hard drives and metal detectors and X-ray scanners, will detectors/scanners cause any damage to my drive? I'm going to my province next week, gonna use an airplane. If it will cause any damage? I'll just leave the drive in my place.

For the video card question, you're comparing apples to oranges. The GT 430 was a low-mid range card when it came out. The GT 610 despite being two generations newer than the GT439, is the lowest of the low end for Nvidia cards, and sorry to say quite a bit slower than the older GT430.

For the ram, try the new stick in the slot the original is in by itself. If the computer works boots, then try the original stick in the other slot, again by itself and see if the computer will boot. If it doesn't boot with the original stick in the second slot, then it is likely a bad slot and not bad ram.

I just also realized my PC is using a single channel RAM, I presumed that the person on the counter is an expert, I just showed my stock RAM to her and she just did the job on finding it, anyone knows what channel is my RAM?

The name of the RAM is KVR1333D3S8N9/2G, can support dual channel which my MoBo does, 240 pin like the MoBo said, it's 2 GB like the MoBo said too, more info here about my RAM.:
http://www.kingston.com/dataSheets/KVR1333D3S8N9_2G.pdf

Both slots are the same, my stock RAM can work in any of the 2 slots, so the new one must work too. Anyways if it's the wrong RAM, it would be fine, I still have the receipt of the transaction. Other questions too, what's the real maximum usable RAM of W7 32-bit? Other says 3.25GB, others 3.72GB others says 4GB, what's the truth? Because I might by a 2x2 GB(I prefer this one but a single 4 GB is cheaper than a 2x2 GB for some reason) or a 1x4 GB RAM.