Identifying a Jasper

Unlike the Falcon transition, the move to Jasper isn't very clean cut. You can't rely on a lot number or manufacturing date to tell you whether or not you've got a Jasper, there are some hints and only one sure-fire way to determine if you're holding a box with a Jasper inside without actually opening the packaging.

The hints are pretty basic: the Xbox 360 Arcade bundles appear to be the best chance at getting a Jasper right now, although there have been reports of some Xbox 360 Pro systems featuring Jasper. As of now there haven't been any confirmed Elites that have the Jasper boards in them. Remember that Jasper is not only a potential fix for the RRoD, but is also a cost reduction for Microsoft - the GPU die is smaller and the power supply is less powerful, which means lower overall costs - something that makes the most sense in the most price constrained of the three Xbox 360s available today: the $199 Arcade.

Xbox 360 Arcade Things to Look For Likelihood that You've Got a Jasper
Lot # 0842X or newer Maybe
Xbox 360 Arcade Sticker Markings XGX-00019 Probably a Guarantee
Xbox 360 Arcade Sticker Markings Value Bundle 2008 E Probably a Guarantee
Current Rating on 12V Rail 12.1A Guaranteed


The first thing you'll want to do is look at the sticker on the outside of the box, this will have the lot number, team and some other potentially useful information. The lot numbers you're looking for are 0842X or newer, although unlike Falcon-hunting, the lot number won't guarantee you a Jasper. The lot number refers to the year and week that the console was built, 08 being the year, 42 being the 42nd week of the year. The X is there for, well, good luck I guess. The team isn't as important as it was in the Falcon days either, Xbox 360 Arcade bundles marked lot 0842X from team CSON and FDOU have been both Jasper or Falcons.

If you can't rely on the lot number and manufacturing team, then what can you? The sticker on the side of the box holds the first clues, while you can find the lot number here that's just a quick way of determining the likelihood of you having found a Jasper (e.g. if your lot number is really old, like 0830 then it's not a Jasper). There are two lines that right now appear to be good indications that you may have found a Jasper, I've highlighted them in the picture below:

If you see this XGX-00019 line below the top barcode, chances are that you've got a Jasper. And if you see this Xbox 360 Arcade System Value Bundle 2008 E line (exactly like that, note that this only applies to Arcade units) then you most likely have a Jasper as well. If you want full confirmation though you'll need to look at the current rating on the 12V rail which, believe it or not, you can do without ever opening the box.

Microsoft cut out a little window in the Xbox 360 packaging to allow the barcode/serial number to be scanned. Looking through this window the information you want is most likely obstructed by the cardboard cutout and it's to the left of the opening. The least destructive way to get access to this information is to push down on the Xbox 360 itself through the window on the right side, which will hopefully reveal the information you're looking for. A quicker, easier and potentially get-you-kicked-out-of-the-store way is to push the cardboard itself to the left a bit, possibly even tearing it slightly, to reveal the text you're interested in. The line you're looking for is this:

12.1A on the 12V rail nets you a Jasper

The important text is the current rating on the 12V line, which is immediately to the left of the current rating on the 5V rail. The three options here are 16,5A, 14,2A and 12,1A. All that really matters is the last digit, if you see a 5 then you've got a Zephyr, if you see a 2 you've got a Falcon (most likely) or if you see a 1 you've got a Jasper (take it and run).

12V Current Rating Xbox 360 Revision
16,5A Zephyr
14,2A Falcon
12,1A Jasper


Now some Jaspers have been mislabeled as 14,2A, but no Zephyr or Falcon has been mislabeled as 12,1A. The explanation is simple, this rating indicates what sort of power supply you'll need to use with the machine. Zephyr and Falcon boxes can't run with only 12.1A on the 12V rail, you'd end up with a box that either crashed a lot, rebooted or had other undesirable behavior (assuming it would even start, assuming you could even find a power supply that you could plug into it). There's only one Xbox 360 power supply that can deliver a max of 12.1A on the 12V rail, that is the 150W power supply that is keyed to only work on Jaspers. Find a machine with 12,1A written on the back of it and you've got yourself a Jasper.

Sneaky Microsoft: Still Shipping Zephyrs

In my Jasper hunting I came across a strange beast, I found an Xbox 360 Pro with lot number 0843X. I figured it was new enough that it could be a Jasper, but looking at the 12V current rating I found that it was a 16.5A unit. I thought perhaps it was mislabeled and I'd heard about some newer systems having a 16.5A 12V rating, so I thought I'd buy it and take a closer look.

Once I got it home I confirmed: the machine was a Zephyr, that's the original Xbox 360 hardware with HDMI support, meaning a 90nm CPU, 90nm GPU and 90nm eDRAM - the very configuration most likely to Red Ring. I'm guessing it's a reworked Xbox 360 that never made it out of the factory in the first place due to an instant failure; something Microsoft fixed and sent out at a much later date.

Even if you don't care about getting a Jasper, it may be worth looking into what it is you are getting to make sure that you're not stuck with a box that's more likely to fail.

Index Confirming Your Jasper


View All Comments

  • Syphadeus - Sunday, January 4, 2009 - link

    Well, after receiving my 360 back from it's THIRD repair (they sent me an Opus to replace my Xenon) and finding that it kept throwing me DREs at random, I decided to hunt for a Jasper today.

    I bought an Arcade unit from GAME here in the UK. I asked if I could have a look at the box first and they said no, so I told them to security sticker it because it was a "surprise gift". Turned out to be a Falcon (14.2A). So I'll be taking that back tomorrow.

    In the meantime, I went to GameStation and asked and they let me look at the boxes - second one I looked at was a Jasper. It was really easy to see as well, didn't have to move the console, the 12.1A rating was immediately viewable through the cut-out, so I bought it and it works fine. That's another £130 I've thrown at MS - and all because I really can't be bothered to wait another 3 weeks for them to repair my replacement, which is a pretty laughable concept considering I'd had it all of four days.
  • Manic Penguin - Thursday, January 1, 2009 - link

    I had the privilege to use an Xbox 360 Pro (60gb version) last weekend at a friends house. He had just bought the box, so naturally i wondered if it had a Jasper board in it. He told me that he wasn't sure, so I checked the back of the system. Sure enough, it had a power rating of 12,1 A. The power supply itself was a Falcon power block, but the power rating and power input jack on the Xbox both matched up to Jasper specs. I would post pics but my sister didn't let me use her camera. I will see if I can get him to send some pics via email. Reply
  • XtraCrispi - Friday, December 19, 2008 - link

    I just bought an Xbox 360 via Dell and when I got it today I was excited to see that the manufacture date and lot numbers corresponded to what I had read for the Jasper. However after finding and reading this article I've come to realize I've got that rare breed you warned about. It's the 1st gen Xbox with HDMI and a manufactured date of 10-23-08. WTF! So mad.

    I might just return the thing because why spend current model prices and take an old model car, right? (No, this Xbox ain't a classic.)

    Good thing I called Dell before I opened it and complained that the packaging was terrible and the Xbox box was damaged. They said I can open it up and try it out and send it back if it's damaged. I might just do it, get a refund and go get a Jasper at a local store.
  • HwaZy - Tuesday, December 30, 2008 - link

    Wow! I was told in early Nov. that MS will not issue pre-Jasper in retail channels. They will be offered as repair replacement or refurbished only.

    I am lucky then and just received my Arcade from DELL today. I wasa a bittle concerned because I used discount coupon. Before I opened it, I confirmed it is indeed Jasper: 12.1V and made 10-18-2008 (3 days after the pictured). The lot#, built-in 256MB memory and bundle label and everything described. Now after opened, the 150W PSU and power connector all confirm it is Jasper. It even has one flyer for the New Experience update.

    Great article!
  • Stop It - Saturday, December 13, 2008 - link

    Hey there all

    I like the article, it helps those wanting to ID their systems well, except for my 360, which...makes no sense.

    My 360 (Lot 0745, Made Nov 2007), uses a 175Watt PSU and the Falcon PSU input, but indicates that it uses 16,5A for its 12V rail, an indication of a Zephyr?

    Now I WAS 100% sure I had a Falcon, and I'm still pretty sure, but this has confused the hell out of me, surely the Zephyr wouldn't even work with a 175Watt PSU...would it?
  • turbobozz - Wednesday, December 17, 2008 - link

    You're not going to have a Zephyr on Falcon current, but you could have a Falcon on Zephyr current.
    Don't sweat it... you were probably right that you have a Falcon.
  • daqman - Friday, December 12, 2008 - link

    I have two words for Microsoft and any other chip maker fo that matter....Gallium Arsenide! Heat would be a non-factor because there is very little resistence with said substance, therefore it would increase speed also. Reply
  • turbobozz - Wednesday, December 17, 2008 - link

    What are you smoking?
    You don't know what you are talking about.
    Using GaAs would make it far, far more expensive.
    And it you're very much misrepresenting the true benefits GaAs has over Si
    (Which aren't generally applicable to the 360.)

    Wikipedia has a decent article on GaAs... look it up.
  • araczynski - Friday, December 12, 2008 - link

    so far my late 2006 xenon has been working flawlessly, i'll keep my fingers crossed that it stays that way. i wonder if anyone has any records as to what ratio of the failed units were xbox live gold members/players :)

    i don't do multiplayer, so perhaps my xbox loves me for not putting it through all the trash talking wannabe kid drivel.

    i can hope can't i?
  • tipoo - Wednesday, May 28, 2014 - link

    So 6 years later, how did that go? Reply

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