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From: Paul 
Newsgroups: microsoft.public.windowsxp.general
Subject: Re: Dell 780 Problem:
Date: Fri, 17 Nov 2017 04:07:52 -0500
Organization: A noiseless patient Spider
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Mark Twain wrote:
> I have verified both DIMMs function one at a 
> time and I have verified that all slots work 
> although I had to press F1 for number 3 and 4 
> slots first before the desktop screen appeared.
> So that all should be functional.  
> 
> The flash player is working again, and I saved the
> files as you suggested.. thanks.
> 
> Here are the specs for the 780 as I bought it. 
> 
>
https://www.staples.com/DELL-780-Tower-Core-2-Duo-2-93GHz-4GB-Ram-750GB-DVDRW-D
rive-with-Win-7-Pro-64bit-Refurbished/product_1498887
> 
> Robert

It's a Q45 Northbridge. The memory type is a function
of the sockets soldered to the motherboard. The
chipset would support 4x2GB DDR2 memory or 4x4GB DDR3 memory.

Since your machine shipped with 4GB total. then the DIMMs
should have been 2x2GB in dual channel mode. They could
go in the pair of black slots, or they could go in the
pair of white slots. Those are the easiest options
to understand. The chipset is new enough, it probably
supports Flex Memory, and in fact you could have dual
channel with one white slot and one black slot. But
the reason they color the slots, is to help recognize
the "pairs" for easiest installation. Matched sticks
in pairs in same-colored slots, operate in dual channel
mode for sure.

But if some slots were damaged, it might still be possible
to get dual channel operation with "mis-colored" slots.
And that's because the Flex Memory is... flexible. There
was a time when the pairing scheme was more rigid and
unbending. Some AMD designs were like that, and the fill
order was kinda fixed on them (only one fill order of merit).
AMD has fixed that on their stuff too now, and it's practically
anything-goes like on Intel. But the older the hardware is,
the greater the chance for rigid fill rules (lazy engineers).

    Paul
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