Tweak3D takes no responsibility for what may
happen to you or your computer by following
these guides. Only attempt any overclocking
or tweaking if you are an intermediate to
It is a well known
fact that the TNT runs at a high temperature.
The main reason for this is the usage
of a .35 micron instead of .25. According
to sources, this was because the .25 micron
was not completed yet. Perhaps it would
have been to expensive at this time. Although the original clock speed was dropped from the spec'd 125 MHz to 90 MHz, with a little work you can get it right where it is supposed to be.
- Let's assume
that you are completely out of money. Even spending
$5 would be way too much for you at this time.
Can you still overclock your card? Sure!
Just using the
standard heatsink on the STB I still had the card
doing 95 Core / 115 Memory for a while. However,
after prolonged abuse the system would hang.
TNT with standard
- Cost $0 (default),
fairly stable up to speeds of 95 MHz core,
115 MHz memory.
- Are you somewhat creative or still on a
tight budget? Make your own cooling from a 486
Go to your local
radio shack -or computer store- and pick one up
for about $5. Place the fan only on the heatsink,
screw it in place to the heatsink using the screws
that attached it to the included heatsink. If
your card already has a fan (e.g.. Canopus Spectra
2500), you're safe for the first cooling step.
TNT with 486
Next - If
you really want to keep that card running
cool and you are willing to take a risk, obtain
some thermal paste or tape, and the heatsink
from the 486 fan/heatsink or another 486 fan/heatsink
combo. Place enough paste on the heatsink
(or fan/heatsink) to make sure that no
metal is touching the other side, and
attach this to the back side of the TNT chip
itself (directly behind the other heatsink).
Before turning on the machine, take another
good look to be certain that no metal from
the heatsink is touching metal of the soldering
pins sticking out of the card. Look
at the picture below for more detail. Place
the heatsink along the orange
square. The square is right next to the soldering
pins that you must be cautious of or you'll
short out your card. This
method is not recommended because of the risk
Where to attach
the heatsink or fan to the back:
- Cost $5 to
$10, fairly stable up to speeds of 105 MHz
core, 115 MHz memory, lose 1 PCI slot -because
of fan width.
- For the very
creative person with a bit more cash.
Go buy a Pentium
cooling fan/sink and remove the heatsink from
your card. Don't know how? It's simple. Run the
card for a while, until it is hot. Shut down the
machine, remove the card. Carefully -using a flathead
screwdriver- pry off the heatsink. They come off
fairly easy. Use a razor blade to scrape off any
hard glue. Use a slightly dampened cloth with
rubbing alcohol to remove the remains of glue.
Wait for the rubbing alcohol to dry and gently
rub a dry cloth on it. When it is dry you're ready
Note that removing
the heatsink will void your warranty!
If the Pentium
cooler is too large, you will have to actually
drill holes in your Pentium heatsink for the capacitors
to stick out. Now, using your thermal goop, attach
mentioned it to me, and I don't feel like destroying
some great cooling equipment to attempt it, peltiers
may do very well also. If you have tried this
and can send me info, please do so.
I've also heard
ideas of people using Pentium II fan/heatsinks
that were filed down. These are much bulkier
still, and you may lose yet another PCI slot.
Cost $10 to $30, stable up to speeds of 110 MHz
core, 115 MHz memory (??? - not tested, assumption-
), Lose 1 or even 2 PCI slots.
- This is for the
person that always wants to buy the best, and
wants all the PCI slots possible.
has a long reputation for making awesome cooling
products. With the Stealth for voodoo2, Lasagna
for everything else, etc, they have maintained
their spot as one of the best companies for cooling
graphics cards. The Lasagna is only 11 mm wide,
which makes it especially appealing for cooling
video cards. If you order one of these, you need
a step-up block for most TNTs too, which costs
about $2 more.
other choices have a few issues which may
be annoying, the Lasagna is the best solution
so far for the TNT. It will offer very good
power, is quiet, and frees up a PCI slot because
it is so thin. The cooler is pretty cheap,
too. You still will have to remove the heatsink
from your card. See above for more info.
If you're interested
in the Lasagna, check out TennMax's
site now. and do not forget to see the impressive
results below. If you have a Viper V550 or Creative
Labs TNT, you will not need to purchase
the extra tall step-up block needed for
attaching to the STB Velocity 4400.
Cost $17 to $19, very stable at speeds of 115
MHz core, 120 MHz memory -perhaps higher-, does
not take up an extra PCI slot, can be used
in the future with other cards, dependable upside-down,
the default speed is 90/110 (core/memory)
MHz clock. Unstable results were not included.
All shown results were with the TennMax Lasagna,
which proved to be the best solution. Because
overclocking results are almost never significant
at lower resolutions, only 800x600 and 1152x864
were included. Also keep in mind that when
overclocking, a few MHz goes a long way. A
difference of only 10 MHz can make a huge
impact on framerates. Memory
clock results are dependent on the brand/speed
of memory the card uses.
Pentium II 450
ABit BX6 mainboard
64 MB PC100 SDRAM
STB Velocity 4400 AGP (Using NVIDIA
Reference Drivers v0.48)
Diamond Monster Sound MX200
Refresh rate set at 80 Hz
Windows 98 OSR 2.1
Fresh install of all software (no tweaking)
features at a glance
is a summary of each of the cooling methods.
PCI slots inaccessible due to size
is the number of PCI slots that the cooling
will cover (making them inaccessible) on most
motherboards, assuming the card is AGP. This
is a bad thing :)
was calculated by observations of the dangers
present during installation.
cooling fan w/ heatsink on back
cooling fan sandwich
configurations had the same cooling on both
sides of the card
Core clock speed
Memory clock speed
PCI slots inaccessible
due to size
(out of 100)
Risk involved (out
There is no mention of
peltiers at this time for a few reasons. First,
they cost a lot more than any of the choices
above. Also, they are very risky on video
cards. Condensation can short out the card.
If the fan fails to cool the peltier, the
video card will be destroyed by the overheating
peltier. Also they take a lot of space, and
However, for the daring
and brave, a peltier can lead to amazing results.
Here's an e-mail I received from a fellow
tweak monkey, who took matters into his own
hands and crafted a peltier cooling device
for his TNT.
Hi, just thought
you'd like to know that I got my STB Velocity
running at 137 Mhz Core(Very Stable) and 115
Mhz Memory Timings.
How I did it:
A) Installed a 486-Style Fan on top of the
B) Installed a 486 HeatSink on the backside
of the Board
A&B above are from Tweak3D followed his suggestions
*C)* Increased my Voltage supplied to the
DRAM, ChipSet, AGP, and CPU's
I/O Buffer from 3.5v to 4.0v. (My motherboard
is the Asus P5A, to do so
on that board, move the jumper from VIO1 over
1&2 to VIO0 over 2&3).
I then tried bumping up the Core and got upto
~128 Mhz. Then started
moving up my Memory Timings and got that to
120 before things got funky.
Being the overclocker that I am I still wasn't
happy so I pealed off the
Standard HeatSink that came with the STB V4400
and put on my CPU's
Peltier Fan, put a ball bearing on the pentium.
Tried again and took her all the way up to
137 Mhz Core / 115 Memory.
If you try to take the Memory timings above
120 or the CPU above 150 the
whole system will lock up after one minute
Quake 2 looks Very Normal at 137 Mhz there
is a slight bit of flickering
in items at long distances but nothing extremely
I'm running a Socket 7 100 Mhz bus. I assume
if you increased the bus
to 105-120 you'd have to decrease the Core/Memory
Timings. I'd try this
but my Pentium just won't handle it :) (can't
wait 'til I get money
for a K6 Processor).
the money, time, and are willing to take the
risk, make sure share your results with me
if you use a peltier when overclocking your
Cooling the TNT is not
an easy task. With a little creativity and
a lot of effort you can gain tons of performance
-especially at higher resolutions- by overclocking
a properly cooled card, or gain overall stability
if your card is too hot.
The best solution in
these instance was easily the single
TennMax Lasagna, a product that is fairly
inexpensive for its quality. Besides the performance,
the fan is durable, can remain upside-down
for long periods of time, uses little power,
isn't so large that it takes PCI slots, and
is quiet. Make sure to read more about it
on the TennMax
Other notable methods
were the Pentium II cooler if you have the
supplies and time, and the 486 fan because
it is simple, cheap, and works well.
I would avoid the sandwich
ideas unless you really need performance,
and are willing to take the time and risk
for its construction.
Any comments you want to
add? Ideas? Suggestions? Let me
Problems? Head to the discussion