Frequently Asked Questions (Technical):

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Frequently Asked Questions

(Technical)
:

Citrix XenDesktop with HDX 3D
Pro

Graphics


Updated
November

2010

When should HDX 3D Pro Graphics be used?

HDX 3D Pro Graphics should be used when delivering high
-
end 3D graphics applications, especially over
challen
ging network connections (limited bandwidth, high latency)

or when CPU
-
based graphics
rendering does not provide adequate performance
.
It is designed to meet the needs of design engineers
and 3D graphics professionals.

Many high
-
end 3D applications requir
e a graphics processor

(GPU)

to run at all; Autodesk Inventor and
Das
sault CATIA are good examples.
Other OpenGL/DirectX applications
may run without a GPU but
perform
much better
when

a GPU is available
.
HDX 3D Pro Graphics is the perfect solution for del
ivering
these applications.

If you only need to deliver typical office applications and multimedia content, then
HDX 3D Pro Graphics
would be

overkill.

What

are the system requirements for HDX 3D

Pro Graphics 1.
1
?

The detailed system requirements for HDX

3D
Pro Graphics 1.
1

are published in
Citrix HDX 3D Pro
Graphics 1.1 Administrator's Guide
.
Highlights are provided

below
.

What are the network requirements for HDX 3D Pro Graphics?

For deep compression, HDX 3D Pro Graphics includes a GPU codec that provides optimal performance at

connection speeds of 2 Mbps or more, with up to 200 ms roundtrip latency.
However, it sho
uld be noted
that some customers have reported good results even at 1.5 Mbps and with latencies above 300 ms. The
consistency of the network latency tends to be more critical to the user experience than the absolute
value of the latency.

If the connection

speed is over 3 Mbps, then the HDX 3D Pro Graphics CPU codec provides a lower cost
alternative since a less expensive graphics card is sufficient for just 3D rendering.

What are the software requirements for HDX 3D Pro Graphics 1.
1
?

The host workstation
(data center workstation) must run
one of the following versions of Windows:



Windows XP 32
-
bit

Professional with SP2 or SP3



Windows XP 64
-
bit
Professional



Windows 7

32
-
bit





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2



Windows 7 64
-
bit

The HDX 3D
Pro Graphics
1.1
host
-
side software installs on top of
t
he
XenDesktop 4

or XenDesktop
4

FP1
Virtual Desktop Agent (VDA)

software. It can be used
together
with a XenDesktop 3 or XenDesktop 4
Desktop Delivery Controller (DDC).
The current version of the HDX 3D Pro Graphics feature cannot be
used with a XenDesktop

5 delivery controller.

On the user device, we recommend using version 12.1 of the Citrix online plug
-
in for Windows, which
supports both the GPU and CPU codec options. Version 11.100 of the Citrix Receiver for Linux provides
support for the HDX 3D Pro Gr
aphics CPU codec.

What are the hardware requirem
ents for HDX 3D Pro Graphics 1.1
?

Host workstation
:
Citrix recommends selecting a platform that is endorsed by the ISV
(
s
)

whose
applications will run on it. Specifically, t
he host workstation
must have an ad
equate GPU for the
particula
r applications to be delivered, and
most software
vendors publish recommendations for this
.
In
addition, we recommend a quad core
processor

because one core will be heavily used by the HDX 3D
Pro Graphics
picaDispMgr.exe

process
.

To leverage GPU
-
based compression (our best compression technology for delivering 3D graphics over a
low bandwidth
WAN/Internet connection), a CUDA
-
enabled
(minimum CUDA 2.1)
NVIDIA GPU with at
least 96 cores is required

(128
CUDA
cores
preferred
)
.
This

is only necessary when minimizing
bandwidth consumption is critical (
less than 3 Mbps
).
NVIDIA graphics cards are widely supported by 3D
graphics ISVs.
Recommended cards

for use with the GPU codec

include
the
Quadro FX 3700, FX 4600,
FX

4800, FX 5600, and

FX 5800. With the current 1.1 release of the HDX 3D Pro Graphics feature,
NVIDIA’s new
Fermi
-
architecture cards

such as the
Quadro

4000, 5000 and 6000, can be used only with
the CPU code
c.

Over a mid
-
level DSL
-
like network connection (3 Mbps and above), CPU
-
based based compression

(JPEG
XR)

is fine, in which case you can use any GPU that is adequate for the applications to be delivered
,
including NVIDIA and AMD/ATI

GPUs
.

To use Multi
-
GP
U
Pa
s
sthrough, a new feature of XenServer currently available for Tech
nology

Preview

which
supports

multiple graphics cards on a host (one card per user), it is necessary to use NVIDIA GPUs
that support
SLI Multi
-
OS
, such as the FX

3800, FX

4800 and FX

5800.

Although blade and rack workstations are envisioned as the ideal platforms for the HDX 3D
Pro Graphics
technology, regular freestanding workstations are
also
suitable. We recommend at least 4 GB of
RAM
and a quad core CPU.


User device
:
A regular PC (3.0 GHz Pentium 4 or
equivalent
, with 1 GB RAM
) is sufficient as the user
device.
For best results, we recommend a dual core CPU.
A GPU card is not required
on the user device
since the graphics renderin
g is done on the host workstation. A higher
-
end thin client can also be used





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3

(
fast single core CPU
equivalent to
3.0 GHz
Pentium 4, with 1

GB RAM
, or dual core 1.5 GHz
)
; low end
thin clients typically do not have adequate processing power to keep up with t
he data coming from the
host.

Are multi
-
monitor configurations supported?

The u
ser device can be equipped with multiple monitors, but only one screen can be used to display the
HDX 3D Pro Graphics virtual desktop in this release.
Please contact Citrix Xen
Desktop Product
Management for information regarding true multi
-
monitor support.

What is the maximum screen resolution?

The system does not enforce a maximum screen resolution. The higher the resolution, the more data
that
needs to be sent over the networ
k. In our experience,

a user on a 2 Mbps WAN connection will
experience good responsiveness with a screen resolution of up to 1280 by 1024, whereas higher
resolutions work well
when more bandwidth is available (such as on a LAN)
.

Does the HDX
3D Pro Graph
ics technology support seamless application delivery?

Yes
!

This means that as an alternative to delivering a full virtual desktop, this technology can be used to
deliver indi
vidual 3D graphics applications which are seamlessly integrated into the user’s lo
cal Windows
desktop.

What data center workstations
are appropriate for hosting

HDX 3D Pro Graphics?

B
lade and rack workstations are envisioned as the ideal
host
platforms for HDX 3D
Pro Graphics
,
although any form factor is acceptable
.
T
he following are e
xamples of data center workstations that
support NVIDIA GPUs with 96 CUDA cores or more

(required when bandwidth consumption must be
kept to an absolute minimum)

and have w
orkstation
-
class graphics and ISV certifications
:



HP xw460c blade workstation



Dell
Precision R5400 rack workstation

Numerous other models are also suitable platforms for HDX 3D Pro Graphics.
All leading server
and
workstation
vendors have
recently
been announcing
new models
that include GPU support
, so please
check with your
preferred

vendor for the latest information.

Can I install a hypervisor on the host workstation
?

Yes.
A

new technology

was

introduced

in XenServer 5.6

on a
T
echnology
P
review basis
c
alled

Multi
-
GPU
P
assthrough


which
allows graphics cards to be assigned to users on a one
-
to
-
one basis
.