Write-through - write to main memory at same time cache is written to to
avoid memory mismatches.
Write-back - write only ot cache memory, & update main memory whn you have a
cache miss regarding that particular chunk of memory.
I think that write-thru is safer, while write-back is faster. However, I
believe this option also depends on the capabilities of the cache memory
installed on the motherboard (L2)... I would just leave it at factory
default... I remember I played with those settings once, & really couldn't
tell the difference.
> -----Original Message-----
> From: Drew Hunt [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, January 18, 2001 2:58 AM
> To: RedHat general mailling list
> Subject: Drew's 486 problem
>
> Thanks for the suggestions. What exactly would happen if I overclocked
> the
> bus devices? Device failures or permanent damage?
>
> As for the CPU, I double-checked and it definitly says "A
> 80486DX4-120-SV8B". According to my reading of the motherboard manual,
> that
> puts it at 120 MHz (40MHz MB x 3). The manual doesn't ID any chips beyond
> 100 Mhz specifically, only by model.
>
> By the way, do you know what the difference between Write Through and
> Write
> Back cache is? And the difference between internal and external cache
> memory? There are a couple of settings in the BIOS that address this
> feature for these types of memory, but I'm not sure how to manipulate
> them.
> i know the CPU is capable of write-back (isn't that internal cache?). The
> defaults are write through and that seems to work well enough for now.
>
> Thanks,
> Drew
>
> PS - Diane, your email address returned undeliverable the first try.
>
> -----Original Message-----
> From: diane napolitani
> Sent: Wednesday, January 17, 2001 2:12 PM
> To: [EMAIL PROTECTED]
> Subject: RE: Drew's 486 problem
>
>
> Well, if I remember correctly, the fastest 486 out was an AMD or Intel
> 4/100, I have had the AMD one myself in the past. Now, with either VLB
> or PCI busses, those chips would be running at 33Mhz system bus anyhow,
> so the CPU could not be running at 40x3 without overclocking every other
> component of the system (a very, very bad thing; I overclock, but NEVER
> the bus speeds, that is part of what made then Cyrix unreliable). The
> multiplier is definately a 3 times, as was the case with the 4/75 as
> well, but the 4/100 had the higher bus speed of 33Mhz. I can't tell you
> what to think abbout it, but if it were me, I would set it at 33Mhz with
> a 3x multiplier anyhow just for compatibility with the other hardware
> that is designed to run at <= 33Mhz.
>
>
>
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