Slow ping on rtl8139?

General Information :
Type : Intel Celeron D
Internal Specification : Intel(R) Celeron(R) CPU 2.40GHz
Model Number : 320
Codename : Prescott
Revision : D0
Technology : 0.09µ
CPU ID : F.3.4
CPU IDEx : F.3.4
Microcode : MU0F3417
Architecture : NetBurst

Instructions :
IA-64 Technology : No
Intel64 (EM64T) : No
AVX : No
FPU128 : No
SSE5 : No
SSE4a : No
SSE4.2 : No
SSE4.1 : No
S-SSE3 : No
SSE3 : Yes
SSE2 : Yes
SSE : Yes
AES : No
Extended 3DNow! Technology : No
3DNow! Technology : No
3DNOW Prefetch : No
3DNow! Pro Technology : Yes
AMD MMX Technology : No
MMX Technology : Yes
Cyrix MMX Technology : No
FMA : No
FMA4 : No
OSXSAVE : No
XSAVE : No
XOP : No
F16C : No
MOVBE : No
PCLMULQDQ : No
CLF - Cache Line Flush : Yes
CX8 - CMPXCHG8B : Yes
CX16 - CMPXCHG16B : No
CMOV - Conditionnal Move Inst. : Yes
MON - Monitor/Mwait : Yes
POPCNT : No
RDTSCP : No
SEP - Fast System Call : Yes
TBM : No
BMI : No

Miscellaneous :
XD - No-execute Page : No
VT-x - Virtualization : No
TXT - Trusted Execution Techno... No
SVM - Secure Virtual Machine : No
FPU - Co-processor Built-in : Yes
FXSR - Fast Float Save & Restore : Yes
xTPR - Send Task Priority : Yes
DAZ - Denormals Are Zero : Yes
FFXSR : No
LAHFSAHF : No
CMPLEGACY : No
ALTMOVCR8 : No
ExtApicSpace : No
3DNow! Technology : No
PBE - Pend. Brk. EN. : No
LAHF - LAHF/SAHF Inst. : No
ABM : No
MASSE - Misaligned SSE : No
OSVW - OS Visible Workaround : No
IBS : No
P1GB - 1GB Page Size : No
SKINIT, STGI, DEV : No
WDT - Watchdog Timer : No

Features :
DTES64 : Yes
x2APIC : No
APIC - Local APIC Built-in : Yes
VME - Virtual Mode Ext. : Yes
DE - Debugging Extension : Yes
PSE - Page Size Extension : Yes
TSC - Time Stamp Counter : Yes
MSR - Model Specific Registers : Yes
PAE - Physical Address Extension : Yes
MCE - Machine Check Exception : Yes
MTRR - Memory Type Range Reg. : Yes
PGE - Page Global Enable : Yes
MCA - Machine Check Architecture : Yes
PAT - Page Attribute Table : Yes
PSE36 - 36-bit Page Size Extension : Yes
PSN - Unique Serial Number : No
DS - Debug Trace & EMON Store : Yes
SS - Self Snoop : Yes
ACPI - Software Clock Control : Yes
TM - Thermal Monitor : Yes
TM2 - Thermal Monitor 2 : No
EST - Enhanced SpeedStep Tec... No
HTT - Hyper-Threading : Yes
SBF - Signal Break on FERR : Yes
DSCPL - CPL qualified Debug Store : Yes
CID - Context ID : Yes
LT - LaGrande Technology : No
PDCM : No
DCA - Direct Cache Access : No
EPS - Enhanced PowerSaver : No

Features Hyper-Threading :
Technology : Yes - Disabled

Virtualization :
VT-x : No

Addressing Information :
Physical Addressing max. : 36-bit
Linear Addressing max. : 32-bit

Advanced Settings :
In Order Queue Depth : 12
Fast-Strings : Yes
x87 FPU Opcode : No
Thermal Monitor : No
Split-Lock : Yes
Performance Monitoring : Yes
Prefetch Queue : Yes
Branch Trace Storage : Yes
C1E - Enhanced Halt State : No
Temperature Control : 66 °C
PRB - Performance Requirement Bit : No

Mainboard Upgradeability :
Socket/Slot : Socket 478
Upgrade interface : Socket 478
Supported Speed : 2639MHz(or more)
Supported Voltage : 3.3V


Multiplier : 18x
Low/High Multiplier : 14x / 18x
Multiplier Locked : Yes
Marketing Frequency : 2400.12MHz

Front Side Bus Information :
Bus Speed : 153.3MHz
FSB Frequency : 613.3MHz (QDR)
Turbo Mode : No

Initial Frequencies :
Frequency : 2400MHz
Bus Speed : 133.34MHz (QDR)
Multiplier : 18x

Control Clock Frequency :

Thermal Information :
Thermal Design Power : 73 W
Thermal control TM1 : Yes - Disabled
Thermal control TM2 : No
Thermal Control Circuit : No
Digital Thermal Sensor : No
Clock Modulation (ODCM) En... No

Processor Performance Information :
Throttle Mode AC : Adaptive
Throttle Mode DC : Adaptive
Current Configuration : Adaptive
Throttle : 2639MHz

And the overclocks in bios set the pci bus at 36mhz

I use speedfan to automatically overclock to 2.7ghz and this sets the pci bus to 38mhz

This was not stable until i set the ram voltage to 2.65. via bios

I still have to watch the heat. there is no fan on the cpu.

The results?

Yes the pci bus seems to influence the ping results. When @ 38mhz the ping goes down to 80ms this is still too much. And peak bandwidth was 75mbps xD and 6mbps up

All my personal pc's also had the pci set to 38mhz.

The other difference i noticed is bios minimum pci latency setting is 32. Which could be much lower. I usually set this to 2 whenever available.

I have pcilatency tool, but on all pc's i have it installed on since about a month ago. The settings for most irq's are unchangeable. I have no idea what changed. I should be able to change all settings as i have in the past.

Any ideas on what more i can do to reduce ping on this pc?