Could you please mention in your other post that you're no longer using the T5600? It can take some time to find or dig up an answer rather than just refer a person to the manual or spec. sheet. You can also reply to or edit your own posts.
P.S. Another option, especially if buying new, is use the call, email, or chat floating button at Dell.com. There's no pressure sales tactics. I've used it myself a few times. Or use the "Contact Support" link below, then tap/click "sales." The aforementioned options will show.
- Please kudos posts you like! - Please "Accept as Solution" posts that are a solution. - If you have an Optiplex, stating its model number AND size speeds up troubleshooting. Components vary.