Upgrading Macbook Pro 10.4.11 os x...

Hi there!
I have a few questions about upgrading my operating system. My system is as follows: 10.4.11 Tiger, Processor (2.2 GHz Intel Core 2 Duo), Memory (2 GB)
I have a copy of 10.5 Leopard, as well as the one that follows, but I am worried if installing it will ruin what I currently have on my laptop. I'm running Parallels version 4 with windows xp (i think). Here is what I'm having concerns about, sorry I am not super tech savvy!
- Will Parallels 4 be able to run efficiently on 10.5?
-Is upgrading to 10.5 from 10.4.11 really as simple as inserting the disc and letting it run? I'm worried I will lose Parallels and all of my architecture software such as AutoCAD, Revit, etc.
-I'm currently pretty close to being maxed out on memory. Will upgrading be an issue? And before you ask, yes, I have backed up my files onto an external drive.
-Anything else I should be concerned about? I don't have the money right now to be purchasing new expensive software or equipment so I'm freaking out that if I upgrade, it will destroy my laptop that I need for work and I will lose all of my programs.
Any help would be greatly appreciated!!
Thanks!

oddball11 wrote:
- Will Parallels 4 be able to run efficiently on 10.5?
Mac OS X Leopard removes support for Classic apps. As Parallels 4 is not a Classic app, you will be able to keep using this application after upgrading to Mac OS X Leopard.
oddball11 wrote:
Hi there!
-Is upgrading to 10.5 from 10.4.11 really as simple as inserting the disc and letting it run? I'm worried I will lose Parallels and all of my architecture software such as AutoCAD, Revit, etc.
The upgrade will keep all your applications, including PowerPC apps. Also, as you have got a backup, you can restore it if you have got any problem.
oddball11 wrote:
-I'm currently pretty close to being maxed out on memory. Will upgrading be an issue? And before you ask, yes, I have backed up my files onto an external drive.
Delete files from your hard drive or you may have performance problems. Then, upgrade to Leopard.
oddball11 wrote:
-Anything else I should be concerned about? I don't have the money right now to be purchasing new expensive software or equipment so I'm freaking out that if I upgrade, it will destroy my laptop that I need for work and I will lose all of my programs.
Nothing else.
Also, instead of upgrading to Mac OS X Leopard, I recommend you to upgrade to Mac OS X Snow Leopard, which is a more modern and stable OS X version, and it is quite cheap > http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
In both cases, after upgrading, open  > Software Update, and install the most recent Mac OS X version.

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Ciao.

I need to upgrade MacBook Pro

Hello and happy new year to you guys!
I own a MacBook Pro 15" 2,53 GHz mid-2009. since I'm a poor student I can't really afford buying a new one for now, I just purchased an iPad mini 2 (which I don't regret at all).
So here I wanted to upgrade it since the ram seems to be not enough now (It has 2x2 gb), I always only have 800 - 150 MB left. I am not sure if it's why my Mac is a little bit slow, but anyway. I decided to upgrade the ram.
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http://www.amazon.fr/Komputerbay-DDR3-SODIMM-broches-1066Mhz/dp/B0031GELDM/ref=s r_1_1?ie=UTF8&qid=1420154084&sr=8-1&keywords=SO-DIMM+DDR3+PC3-8500 the problem is there are multiple versions of it, like:
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I really wanted to do all this by myself I've checked here: http://support.apple.com/fr-fr/HT1270#link2 but I still have no idea what HS and HS Apple mean, please help.
Since I am here I wanted to ask a few more question:
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-Also is there a site cheaper than Amazon to buy the rams? I live in France.
-And is it worth buying a new bluetooth card so I can use Handoff on my MacBook Pro with my iPhone 5 and iPad mini 2? While looking for upgrading my MacBook Pro I've read that I could actually upgrade the bluetooth to use Handoff.
Thanks for reading. (Sorry English is not my native language)

I looked at the Mactracker program and it says the memory specs for the Mid 2009 MacBook Pro 15" are:
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I think the "Apple HS" and "HS Apple" and "HS" are just minor typo's, as could not find anything like those comments in my looking at US memory web sites. When you get the memory look closely at all the memory chips on each of the cards - they should all be the same make/model/speed/type if good quality memory - not chips from several makers on the same card even if the specs might be the same.
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gpt show: disk0: Sec GPT at sector 976773167
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          2         32         Pri GPT table
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511109336    1269544      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
512378880 464394240      4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
976773120         15
976773135         32         Sec GPT table
976773167          1         Sec GPT header
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If it is a Intel based version it will work on Lion and ML.
If it is a PPC based version it will not work with Lion or ML.

Upgrading Macbook Pro 10.4.11 os x...

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