Your machine max can go 10.5.8, you need to look for 10.5 retail box.

LOL, then you should tell the management consider getting a new iMac or MacPro for long term investment. This machine is 6years old there's a limit of what it can do.

Are you running on battery when u experience the slow-down?
Check under your "Energy Saver" setting and see if the performance is set to best.

Newer MacBooks are design to put power consumption as priority over performance.

We installed few 1333MHz module into MacBooks & MacBook Pros before, it work and even recognize as 1333MHz in System Profiler. But the Mac will only run at 1066MHz no matter what you do.

We've used Team & Crucial brand. But same brand might uses different chip.

Barefeats published benchie on the new hybrid drive vs 7200rpm hdd vs ssd.
http://barefeats.com/hard134.html

@kosy90 it highly depends what chip is on the 1333 module. I suggest you return the pair for another brand or different part#.

Sadly Apple do not provide CTO HDD option for entry level iMac.

It was available before the 2011 model. We are kinda surprise Apple pull that off. Forcing buyer to go for higher end models.

You will most likely get KVR only. General IT store seldom keep stock for KTA.

Just bring ur Mac and test on the spot lo.

How much you paid for the 1066 KTA? Is it kit set?

You can enable TRIM yourself. I'm using 2x Apple SSD, by default the TRIM wasn't enable. I have to manually enable it. Neither I get TRIM on my other older Apple SSD. Strangely, maybe only on newer model you'll get TRIM enable by itself.

Never use OCZ Vertex series, maybe other owner can share their input?

External USB drive doesn't necessary be Apple flavor. Most USB external DVD burner works in OSX. I personally tested Buffalo, Asus, Samsung.

Bring it to the reseller and get them do it for u.

RM900 can get you a decent SSD already. Now you all know why Machines is everywhere.

Maybe I should start charging that way to afford a premium store.

If you break the case, you might not get warranty. Even the HDD.
You can get 1TB drive from C-Zone lowyat or Digital Mall, it fit Unibody MacBook Pro..

Dude, that is KTA, not some cap-palang value RAM. If you can get KTA RM68-90 let me know k. We will sapu whole box.

In real world, it's more like demand low = high cost to bring in.
The prices for KTA has gone down alot. Compare to those days where value RAM vs KTA can be as much as 1:2. Now it's merely 5-15% extra.