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punjabimunda
SCSI Port
Posts: 32
Registered: ‎06-23-2012
Location: Toronto
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Message 1 of 10

ThinkPad 65W vs 90W Adapter

Hi all,

(I did search for this but couldn't find an exact answer. So in case this has been asked before, just point me to that link and sorry).

 

What is the difference between the 65W and 90W charger (if any?) Is it worth spending the extra $55?

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Message 2 of 10

Re: ThinkPad 65W vs 90W Adapter

The 65W is smaller than the 90W but provides less power.

For which model are you buying the adapter?

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punjabimunda
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Message 3 of 10

Re: ThinkPad 65W vs 90W Adapter

The T420!
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Message 4 of 10

Re: ThinkPad 65W vs 90W Adapter


The 90W weighs about 350gm. The 65W weighs about 250gm. The 90W is slightly larger physically than the 65W.

 

But the main difference is that with the 65W adapter and the battery removed, most ThinkPads run at reduced CPU speeds. 

 

So unless size/weight are the primary concern (in which case why a T420 rather than a T420s or T430s?) you're better off with the 90W adapter.

 

Added:

Is it worth spending the extra $55?

Lenovo Canada includes your choice of 65W or 90W adapter with the ThinkPad. You can order a spare which costs (IIRC) $50 for the 65W and $55 for the 90W. If you want one of each, get the 90W with the ThinkPad then buy the 65W separately. That way you'll save $5.

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Message 5 of 10

Re: ThinkPad 65W vs 90W Adapter

Normally, Lenovo ships Optimus enabled models with the 90W adapter and the other models with the 65W adapter.

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punjabimunda
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Message 6 of 10

Re: ThinkPad 65W vs 90W Adapter

Yeah, but do I really need the 90W is what I am confused about. So if I am to run my T420 (no dedicated graphics card), is the 90W still required? I am not bothered much about weight, I just need to know whether it will be worth or it won't make any difference Smiley Happy
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Message 7 of 10

Re: ThinkPad 65W vs 90W Adapter


@nibs wrote:

Normally, Lenovo ships Optimus enabled models with the 90W adapter and the other models with the 65W adapter.


Good point. I forgot to mention that systems with discrete graphics require the 90W adapter.


@punjabimunda wrote:
Yeah, but do I really need the 90W is what I am confused about. So if I am to run my T420 (no dedicated graphics card), is the 90W still required?

It's not required but it's recommended, especially if you use the system without the battery, e.g. in a desktop environment. You also need a 90W adapter if your battery is RapidCharge, but that's not your situation.

 

Here's a handy chart that summarizes what wattage adapters work with the Tx30 series. It should also apply to the Tx20 series.

 

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joel_marthoma
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Message 8 of 10

Re: ThinkPad 65W vs 90W Adapter

Hi all , even in confused with the same query. Mine is t430 and the adapter I had got with it was 90w 20v rating. It got damaged. However inside the laptop, the cell mentions that even 65w chargers will do. So which one is preferred? Shall I go forward with the 90w?

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Message 9 of 10
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Re: ThinkPad 65W vs 90W Adapter

Community SeniorMod
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Message 10 of 10

Re: ThinkPad 65W vs 90W Adapter

On the T430, use 90W if you have discreet graphics.  If you have integrated, either will work.

 


Rich


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